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?Look at crystals of table-salt under a magnifying glass and you will see that each crystal is a cube with six faces.
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?Hardened steel and brittle materials such as glass and ceramics are not normally amenable to diamond turning.
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?There are no constants at all, and measurements of time and space depend on the position of the observer¡ªthey are relative.
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?Properly speaking, not all substances exist in three states.
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?This situation did not often occur.
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?One wonders also why Nature, with some snakes concocted poison of such extreme potency.
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?The performance of the machine is short of the requirements. ?Õą̂»úÆ÷µÄÐÔÄÜûÓдﵽҪÇó¡££¨be short of ¶ÌÓï¾ßÓзñ¶¨º¬Ò壩 ?The angularity of the parts is too great for proper assembly. ?Áã¼þб¶ÈÌ«´ó£¬²»ÒË×°Åä¡££¨too¡for¶ÌÓï¾ßÓзñ¶¨º¬Ò壩
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?Indirect evidence suggests that they (Neptune¡¯s rings) exist, but as arcs rather than true rings.
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?Without the laws of motion as a basis, thousands of discoveries and inventions would have been out of the question.
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??£¨¶þ£©×ªÒëΪ¿Ï¶¨¾ä?Dynamics is a discipline that cannot be mastered without extensive practice.
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?To fix the column ends is difficult, if not impossible, so that the factors n=2 or n= 4 would apply.
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?Îå¡¢¼¸ºõ·ñ¶¨¾äµÄÒë·¨?ÔÚÓ¢ÓïÖУ¬¼¸ºõ·ñ¶¨ËäȻûÓÐÍêÈ«·ñ¶¨£¬µ«¿Ï¶¨µÄº¬ÒåºÜÉÙ£¬Í¨³£ÕâЩ¾ä×ÓÖж¼º¬ÓÐbarely, hardly, rarely, scarcely, few, little, seldom, almost no µÈ±íʾ¼¸ºõ
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?In old China, there was hardly any machine-building industry, to say nothing of automobile and aviation industries.
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?Mercury, so small and close to the sun that its gases were quickly lost to space, is nearly airless.
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?Curiously, Uranus has almost no such excess heat. ?Ææ¹ÖµÄÊÇÌìÍõÐǼ¸ºõûÓÐÕâÖÖ¶àÓàµÄÈÈÁ¿¡£
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?£¨Ò»£©Ò»°ãµÄ·ñ¶¨×ªÒÆ?No battery system presently in commercial production can offer all of theses facilities.
?Ŀǰ»¹ÉÐÎÞÒ»ÀýÉÌÒµ²úÆ·ÖÐµÄµçÆ¿ÏµÍ³¾ßÓÐËùÓÐÕâЩÓŵ㡣£¨·ñ¶¨Ö÷ÓïתΪ·ñ¶¨×´Ó?Nowhere in nature is aluminum found free. ?ÔÚ×ÔÈ»½çÈκεط½¶¼ÕÒ²»µ½´¦ÓÚÓÎÀë״̬µÄÂÁ¡££¨·ñ¶¨×´ÓïתΪ·ñ¶¨Î½Ó?Neither plan is practicable.
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?The motor did not stop because the electricity was off. ?µç»úÍ£Ö¹ÔËת£¬²¢·ÇÒòΪµçÔ´ÖжÏÁË¡££¨Ö÷¾äµÄ·ñ¶¨×ªÎª´Ó¾äµÄ·ñ¶¨£© ?We know of no effective way to store solar energy. ?ÎÒÃDz»ÖªµÀ´¢²ØÌ«ÑôÄܵÄÓÐЧ·½·¨¡££¨·ñ¶¨±öÓïתΪ·ñ¶¨Î½Ó
?In the printing industry there are very few parts that have a predetermined life expectancy.
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?£¨¶þ£© ÔÚÓ¢ÓïÒÔ¶¯´Êthink, suppose, believe, seem, expect£¬feel, anticipate µÈ×÷νÓïÇÒºó½Ó²»¶¨Ê½¶ÌÓïµÄ·ñ¶¨¾äÖУ¬ººÒëʱ£¬¾³£»á³öÏÖ·ñ¶¨×ªÒÆÏÖÏ󣬼´ÔÚÔÎÄÖзñ¶¨Î½Óﶯ´Ê£¬¶øÒëÎÄÖÐÔò¸ÄΪ·ñ¶¨²»¶¨Ê½¶ÌÓï¡£È磺
?Liquids, except for liquid metal such as mercury, are not considered to be good conductors of heat.
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?Our space and time laws don¡¯t seem to apply to objects in the area of a black hole. ?ÎÒÃǵĿռäºÍʱ¼ä¶¨ÂÉËÆºõ²»ÊÊÓÃÓÚºÚ¶´µØÇøÄÚµÄÎïÌå¡£
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?Under no circumstances is aluminum found free in nature. ?ÔÚ×ÔÈ»½ç£¬ÈκÎÇé¿ö϶¼ÕÒ²»µ½´¦ÓÚÓÎÀë״̬µÄÂÁ¡£
?Under no circumstances can energy be created or destroyed. ?ÔÚÈκÎÇé¿öÏ£¬ÄÜÁ¿¼È²»ÄÜ´´Ô죬Ҳ²»ÄÜÏûÃð¡£
?£¨ËÄ£©ÔÚ·ÒëÒ»¸öÖ÷¾äΪ·ñ¶¨¾ä£¬´Ó¾äÊÇasÒýµ¼µÄ¶¨Óï´Ó¾ä£¨ÇÒas×ö¨DÏñ¡¡Ò»Ñù¡¬½â£©£¬µÄ¸´ºÏ¾äʱ£¬¶àÊýÇé¿ö¿É°ÑÖ÷¾äµÄ·ñ¶¨º¬Òå¨D×ªÒÆ¡¬µ½asÒýµ¼µÄ¶¨Óï´Ó¾äÉÏÀ´£¬Í¨³£¿ÉÒë³É¨DÓë¡¡Ïà·´¡¬£¬»òÒë³É¨DÖ÷¾äÖ÷Óï + ²¢²»Ïñ¡¡ÄÇÑù¡¬½ÏΪ¹Ì¶¨µÄººÓï¾äÐÍ¡£È磺 ?The patient did not have a heart attack as the doctor had feared. ?ÓëÒ½ÉúËùµ£ÐĵÄÏà·´£¬»¼Õß²¢Ã»Óи´·¢ÐÄÔಡ¡££¨»¼Õß²¢Ã»ÓÐÏñÒ½ÉúËùµ£ÐĵÄÄÇÑù¸´·¢ÐÄÔಡ¡££©
?An atom is not a solid spherical particle, as it was once thought to be. ?ÓëÈËÃÇÔø¾ËùÈÏΪµÄÏà·´£¬Ô×Ó²¢²»ÊǸÕÐÔÇòÁ£¡££¨Ô×Ó²¢²»ÏñÈËÃÇËùÔø¾ÈÏΪµÄÄÇÑùÊǸÕÐÔÇòÁ£¡££©
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?Carbon dioxide does not burn and support combustion. ?¶þÑõ»¯Ì¼¼È²»×Ôȼ£¬Ò²²»Öúȼ¡£
?If Einstein didn¡¯t have all these qualities, he could never have done what he has done or have the chance of succeeding in what he is trying to do.
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?Lines of magnetic force never touch or (»òand)cross. ?´ÅÁ¦Ïß´Ó²»ÏàÅö»òÏཻ¡£
?The purpose of this chapter is not to describe the various fasteners or tabulate available sizes.
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?Thomas Edison never talked about his own greatness, or seemed to think about it much. ?ÍÐÂí˹¡¤°®µÏÉú´Ó²»´µÐê×Ô¼ºÓÐʲôÁ˲»Æð£¬¿´À´Ò²´Ó²»¶àÏëÕâÖÖÊÂÇé¡£
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?Thus when coal is piled too deeply, heat formed by slow oxidation of coal within the pile can not find a way out and may cause the pile to catch fire of itself.
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