单词:silica granuloma
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gain vt.获得;(钟表)走快 vi.受益 n.增加;收益 gallery n.长廊;画廊;(矿坑中的)地下坑道 gallon n.加仑(液量单位) game n.游戏;比赛(项目);(pl.)运动会 gang n.一
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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,
AS IT IS 2015-07-14 Silica Sand Mining Worries Communities 美国硅砂矿引发社区担忧 The United States is increasing production of oil and natural gas through a process known as fracking. This process is sometimes called hydraulic fracking be
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
Madrid top Spanish basketball league MADRID, Oct. 7 (Xinhua) -- Real Madrid are top of the Endesa ACB basketball league after the second round of matches in the competition on Sunday. Madrid won 100-75 away to Blancos Rueda Valladolid in midweek befo