细胞的这种向里推进标志着原肠胚形成的开始.This pushing - in of cells marks the start of gastrulation.外胚层囊胚的外层,在原肠胚形成之后生后外胚层组织.The outer layer of a blastula that gives rise to the ectoderm after gastrulation....
陆龙卷中心的地面气压如图7.26所示.The surface pressure at the centre of the tornado is shown in Figure 7.26.水龙卷和冰雹偶有出现, 降雪和陆龙卷则属罕见.Waterspouts and hailstorms occur infrequently , while snow and tornadoes are rare....
One of his main themes is the dissimilarity between parents and children.他的主题之一就是父母和孩子的不同之处。The themes get tangled in Mr. Mahfouz's epic storytelling.马赫福兹先生讲述的故事过于宏大，主题有些混乱了。The Observer found the play "a feeble reh...