Ectohumus
[地质]外腐殖质
🗣️ 情景例句
The game was put off due to heavy rain.
由于下大雨，比赛延迟了。
What were you doing when I called?
我打电话给你时你在干吗？
I want to take some books to the classroom. Could you help me, please?
我想把一些书拿到教室里，你能帮个忙吗？