?? 詞語組成解析
a. 軟甲亞綱的
crustacean
[kr?s'tei?j?n]
n. 甲殼綱動物（如蟹、龍蝦）;
adj. 甲殼綱的;
??? 情景例句
But first in the school-rooms.
但首先是在教室 。
You'll know our products better after this visit.
參觀后您會對我們的產品有更深的了解。
Dad, this box is too heavy. We can't carry it.
爸爸，這個箱子太重了，我搬不動。