Pre-cambrian
先寒武纪前
🧩 词语组成解析
abbr. 炼油工程师（Petroleum Refining Engineer）
a. 寒武纪的\\nn. 寒武纪, 威尔士人, 寒武系
🗣️ 情景例句
I'd like to buy some stamps for this letter.
我想买这封信的邮票。
Doesn't matter what you say.
说了也没用。
You'll have to wear this hard hat for the tour.
参观时必需戴上这安全帽。