Trichechiformes
海牛形亚目
🗣️ 情景例句
ready for the graduation ceremony,
为毕业典礼做准备，
The recent rain has had a bad effect on the crops.
最近的那场雨对庄嫁的影响不好。
when the plane suddenly turned round and flew back to the airport.
这时飞机突然调转头来，飞回了机场。