Pregastrulation
原肠形成前期
🗣️ 情景例句
and do it while I talk to my secretary.
我去和秘书说个话。
The post office is right on the corner, You can't miss it.
那邮局就在转角的地方，很好找。
It marked the end of the great tradition of ships with sails and the beginning of a new era.
它标志着帆船伟大传统的结束与一个新纪元的开始。