Holothuroidea
海参纲
🗣️ 情景例句
How long does it take you to get through a letter?
你写一封信要花多少时间？
May I introduce you to my friend Susan?
恕我介绍一下我的朋友苏珊。
they do not realize that they are deprived of the necessities of life.
却没有意识到被剥夺了生活所必需的东西。