Cornstone
n. [地]玉米灰岩
🗣️ 情景例句
Life is full of ups and downs.
生活充满起伏。
The dainties of the great are the tears of the poor.
大人物的美味是穷人的眼泪。
easily obtainable from the lunar rocks in the form of liquid oxygen.
从月球上的岩石中很容易提炼出液态氧，