Somasteroid
a. 体海星纲的,体海星亚纲的
🗣️ 情景例句
It's well worth the time.
这很值得花时间。
He took two weeks off in August.
他在八月份休假两星期。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）