Micromachining
n. 显微机械加工
🗣️ 情景例句
Who's that?
谁呀？
Take it easy.
别紧张。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。