帮忙翻译几个英语句子
不要在线翻译的结果
注意介词的翻译!准确流畅
1.theconductivityofpolyacetylenedropsrapidlyincontactwithair.
2.onceuponatime,boldclaimsweremadeaboutcomputers,thefutureandthe"paperlessoffice".
3.thedoctoradvisedagainsttheuseofthenewtreatment.
4.magneticlinesofforcecannotbeseen,butweknowtheyexistbywhattheydo.
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