| 释义 |
double-shell 英'dʌblʃ'el美'dʌblʃ'el COCA³¹⁵¹¹¹⁺⁴BNC²³⁶²¹³⁺¹
基本例句
n.双壳¹⁰⁰
用作名词There is a case of an oysterlike bivalve that evolved a more and more spiraled shell until, just before extinction, the valves could barely open.这里有个例子，一种牡蛎状双壳类，进化出越来越趋螺旋状的外壳，直到该物种灭绝，其外壳已几乎不能打开。 |