Lighthead
n. 輕率的人, 沒頭沒腦的人
??? 情景例句
Good-bye. Take care of yourself.
多多保重，再見。
Don't give me your cold, man!
不要把你的傷風(fēng)傳染給我！
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.
不僅能夠確定魚群的位置，而且可以根據(jù)魚群回聲的特點分辨出是鯡魚、鱈魚，這是人們所熟悉的其他魚。