Alexln
[医] 补体, 防御素
🗣️ 情景例句
with the school-board committee.
与联合校董会有关。
I doubt that I'll do anything tomorrow.
我不确定我明天将做什么事。
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。