This pushing - in of cells marks the start of gastrulation.细胞的这种向里推进标志着原肠胚形成的开始.The outer layer of a blastula that gives rise to the ectoderm after gastrulation.外胚层囊胚的外层,在原肠胚形成之后生后外胚层组织....
Don't be too downhearted. There's always a way.别太悲观了，总有办法的。Max sighed, sounding even more downhearted.马克斯叹了口气，听上去更沮丧了。We're disappointed by these results but we're not downhearted.我们对结果感到失望，但是并未丧失信心。T...
Edward VIII had done the unthinkable and abdicated the throne.爱德华八世竟主动逊位，真是匪夷所思。He renounced his claim to the French throne.他正式放弃对法国王位的继承权。the accession of Queen Victoria to the throne维多利亚女王即位...