Chymosin used traditionally in cheese making is an aspartic protease extracted form abomasum of suckling calves.传统干酪加工中使用的凝乳酶是从犊牛皱胃中提取出的一种天冬氨酸蛋白酶.We watched the cow suckling her calves.我们看了奶牛如何给小牛喂奶。a cow suckling her ca...
他拿起一把铁锨，挖了个坑，将自己曾经珍爱的物品埋了起来。He took a shovel, dug a hole, and buried his once-prized possessions.我们在夜深人静的时候把它埋到了花园里。We buried it in the garden at dead of night.他被埋在废墟下面达好几个小时。He was buried under the debris for several ho...
变形虫是很简单的生物体.The amoeba is a very simple organism.当环境不利时,变形虫产生包囊.An amoeba forms a cyst when conditions are unfavourable.变形虫, 一种淡水生物, 就是这种情况.The amoeba, a denizen of fresh water, is such a case....