Ech
abbr. echelon 梯形，梯次编队
🗣️ 情景例句
and I'm giving some thought to a new book on a different subject.
如今我又开始在构想另一本不同题材的新书。
He can't decide what to do.
他不能决定做什么。
Rubbish, however, is only part of the problem of polluting our planet.
然而，垃圾只是我们这个星球的污染问题的一个方面。