Well, one and a half hectares of trees could produce enough oxygen to keep your whole class alive and healthy for a whole year.

嗯，一点五公顷的树木就能产生足够的氧气让你们全班的同学健康地活一年。

youdao

Well, one and a half hectares of trees could produce enough oxygen to keep your whole class alive and healthy for a whole year.

嗯，一点五公顷的树木就能产生足够的氧气让你们全班的同学健康地活一年。

youdao