Downcutting
淘刷, 下切侵蚀
🗣️ 情景例句
I owe you a good steak dinner.
我欠你一顿牛排晚餐。
would you mind if I borrowed your car?
我想借用一下你的汽车可以吗？
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。