Ecosystems
n. <生>生态系统( ecosystem的复数形式 )
🗣️ 情景例句
When you learn a new verb, learn its various forms.
学到了新动词时，记住它的各种形式。
Saturday the whole family will clean out the garage.
周六全家动员打扫车库。
Where did you put it?
你把它放哪儿啦？