Hdm
分层开发方法论
🗣️ 情景例句
I always get nervous in her company.
跟她在一起，我老是紧张。
After dinner, they adjourned to the study to talk.
晚饭后，他们到书房谈话去了。
This is done by a great number of ring-shaped air jets on the bottom of the craft.
船底装上大量环状喷气嘴以实现这一目的。