Headwaters
n. 源头, 上游
✅ 同义词
🗣️ 情景例句
Bye.
再见。
He answered almost all of my questions.
他回答了我几乎所有的问题。
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。