Hubble's constant
na. 【天】哈勃常数\\n
🧩 词语组成解析
🗣️ 情景例句
We're very lucky, the three of us ...
我们非常幸运， 我们三个……
It's a matter of life and death.
事关生死。
It's just our policy.
这只是公司的政策。