单词：laboratory environment
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Millions of people worldwide have been reported missing. Many of them went missing as a result of armed conflicts, such as the war in Syria, or in other places of violence. Large numbers of people disappear after natural disasters. A new laboratory e
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081 environment Words (toxic)waste (ari)pollution environment recycling protect acid rain pollutants ecology radiation extinction damage desertification over-fishing rainforest destruction overpopulation ozone layer Unleaded petrol Phrases Create tox
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kneel vi.跪(下) knife n.小刀，餐刀 v.用刀刺(切) knock n.敲，敲打；碰撞 v.敲，打；碰，撞击 knot n.结；节，疤 v.打结，捆扎 know n.知道，了解；会，懂；认识，熟悉 knowledge n.知识；熟悉，了解 lab
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[0:0]lable laboratory lad lag标签,标记 实验室 男孩,小伙子 落后,滞后 [1:9.3533]lamb landlord landscape lane羔羊，小羊 地主，房东，店主 风景，景色 小路，小巷 [1:52.8522]largely laser latter laughter大部分，主要地 激光器 后者的，末了的 笑，笑声 [2:36.6
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引导定语从句的关系代词who，which有时可与that互换使用。但在下面情况，一般只用that. 一、当先行词为不定代词anything， everything， nothing， any， little， one， few， much， all， none等时。如：
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