Sandmark
砂印(轧制时落入耐火材料等物形成的钢板表面缺陷), 夹砂
🗣️ 情景例句
A positive solution
一个好法子
Archeologists still can only surmise as to the origin of Man.
考古学家们对于人类的起源依然无法推测。
You must keep it a secret. You mustn't tell anybody else.
你必须保密，谁都不能讲。