单词：insoluble silica
单词：insoluble silica 相关文章
Plant Self-defense Plants may appear to be helpless in the face of hungry,toothy animals but many plants have evolved interesting systems of self-defense. Coarse meadow grasses are a good example. If you run your finger along a blade of coarse grass,
英语听力文摘 English Digest
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bend,v 使弯曲＝crook 【例】The road bends here 路在这里转弯。 【类】bend:rigid＝submerge:buoyant＝dissolve:insoluble刚性的不会弯曲＝有浮力的不会沉没＝不能溶解的不会溶解
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AILSA CHANG, HOST: Despite mounting evidence and a stream of dire warnings, federal regulators and mining companies failed to protect coal miners from toxic dust. MARY LOUISE KELLY, HOST: NPR and the PBS series Frontline spent more than a year lookin
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