Mascon
n. 质量密集
🗣️ 情景例句
You must be very tired after the journey.
旅行之后，您一定累了吧！
How much is it to rent an economy car?
租一辆经济车要多少钱？
Right from the start there was trouble with the Hubble.
从最开始哈勃望远镜就有问题。