The first organisms that reproduced sexually were free-floating plankton.最早开始有性繁殖的生物是四处漂浮的浮游生物。The fish live on the plankton.这种鱼靠吃浮游生物为生。Plankton is at the bottom of the marine food chain.浮游生物处于海洋食物链的最底层....
The sky since dinner had darkened; it had begun to rain again, to pour fas t.中饭后,天就黑下来, 这会儿又开始下雨了, 而且倾盆猛泻.Cell surface Fas expression in cancer cells increased after treated with MPA.MPA作用后结肠癌细胞表面Fas表达 显著增强.Conclusion Fa...
The equation is simple: research breeds new products.情况很简单：研究产生新产品。...rare breeds of cattle...稀有品种的牛Outstanding dairy Breeds include the Holstein, Guernsey, Jersey, Ayrshire, and Brown Swiss.优良的乳牛品种包括好斯敦牛 、 根西牛 、 泽西牛 、 亚...