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....
Some good might come of all this gloomy business.生意不景气也未必全是坏事。The short-term outlook for employment remains gloomy.近期的就业前景依然暗淡。Inside it's gloomy after all that sunshine.尽管阳光明媚，里面依然暗淡无光。...
This control requires knowledge of attrition kinetics and cyclone effectiveness.这种控制要求颗粒磨损动力学和旋风分离器效率的知识.Biochemists use kinetics to study rates of enzyme - catalyzed reactions.生物化学家们应用动力学研究酶催化反应的速率.Swimming into the 21 ...