Depopulation
[经] 人口下降
📖 牛津释义
depopulation
n[U].
🗣️ 情景例句
Ellen.
Ellen。
He's behind the rest of the class in reading.
他在阅读方面不如班上的其他同学。
it is now possible not only to locate a shoal but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
不仅能够确定鱼群的位置，而且可以根据鱼群回声的特点分辨出是鲱鱼、鳕鱼，这是人们所熟悉的其他鱼。