Sein
vt. （德）存在；（德）是
🗣️ 情景例句
Philip had to go back to the hospital. Philip
必须要回医院。
Because I know many of my colleagues who work harder even with a greater dedication than I do.
因为我有很多的同事工作得更努力，做出一贡献更大。
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。