Echinoid
n. [動]海膽綱動物\\na. 海膽狀的, 海膽屬的
??? 情景例句
Nice girl.
好女孩。
It's two o'clock.
兩點鐘。
but on the second, I applied myself assiduously to the task.
不過，新年第二天，我全力以赴地照著去做了。