Study the floatability of andalusite and mechanism of which with alkyl sulphonate as collecter was accomplished.研究了红柱石的可浮性及其与捕收剂烷基磺酸盐的作用机理.There are abundant mineral resources, andalusite, marble, granite, gold and other...
为什么不给所有的镜头都配上遮光罩呢？Why aren't all lenses supplied with a lens hood?因此我们得制作一块很大的遮光窗帘。We therefore had to contrive a very large black-out curtain.那网球裁判戴着遮光帽檐.The tennis umpire wore an eye - shade....