Trechometer
n. 里程表
🗣️ 情景例句
It has been a learning experience. That's true.
这真是一次学习经验， 真的。
Choice of the end covers choice of the means.
选择目的包含著选择手段。
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。