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....
蟋蟀发出了它们持久的,单调而有意思的调子.The crickets stridulated their everlasting monotonous meaningful note.蟋蟀叫得更欢了。The crickets chirped faster and louder.我们可以听到仲夏时节蟋蟀的尖叫声.We could hear the shrill of the midsummer cricket....
He was putting the finishing stroke to the portrait.他给这幅画作最后的修饰。A prior hemorrhagic stroke raised the risk of brain hemorrhage by more than fivefold.在先前有脑出血性卒中病史的患者中,发现脑出血的风险增加了5倍以上.He had a minor stroke in 1987, which l...