→Because penicillin was widely used， many lives were saved during the war.

　　3．If penicillin had not been available，many people would have died from sickness or even small wounds.(教材P19) →Without (But for) penicillin，many people would have died from sickness or even small wounds. 4．As acupuncture developed，the simple bian stones were replaced by stone needles.(教材P30)

　　→With acupuncture developing/development，the simple bian stones were replaced by stone needles. 5．How acupuncture reduces pain is unclear.(教材P30)

　　→It is a mystery/riddle/puzzle how acupuncture reduces pain. 【课本原句】 In 1999，aspirin was 100 years old and yet there have been more discoveries on how it can help increase the length of people's lives.(P19)到1999年，阿司匹林发现已经有一百年了，但仍有更多的发现它能帮助人类延长寿命。

　　length n．长度 the length of... ……的长度 in length 在长度上 at length 最后，终于 at full length 详尽地，伸展全身 go to great lengths 竭尽全力 lengthen v. 加长，使变长

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