🧩 词语组成解析
[动]口脚类动物
crustacean
[krʌs'teiʃjən]
n. 甲壳纲动物（如蟹、龙虾）;
adj. 甲壳纲的;
🗣️ 情景例句
Your first great-grandchild.
你的第一个曾孙。
He always keeps his words.
他总是信守诺言。
On the first lap, Class 3 were in front.
在跑第一圈时，3班在前边。