Megaparsec
n. [天]百万秒差距
🗣️ 情景例句
We are going upstairs to set up Grandpa's room.
我们要上楼收拾一下爷爷的房间。
You can't count on Tom being punctual.
你不要指望汤姆会守时。
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。