Coelarium
體腔膜, 間皮, 體腔上皮
??? 情景例句
OK.
好的。
A man has his hour, and a dog has his day.
人有稱心時(shí)，狗有得意日。
Since that time, various types of hovercraft have appeared and taken up regular service.
從那以后，各種各樣的氣墊船出現(xiàn)了，并開始了定期航行服務(wù)。