Limnology
n. 湖沼学, 湖泊学\\n[医] 淡水生物学
🗣️ 情景例句
I'm very sorry.
非常抱歉。
This is a poem about frontier life in the United States.
这是关于在美国的边疆生活的一首诗。
If they knew how difficult it was to drill through the hard rock, they would lose heart.
如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。