Complementing
[电] 求补
🗣️ 情景例句
Hello, may I speak with…?
喂， 我可以和……说话吗？
Besides the required courses, I'm taking an elective in the Lab Science.
除必修科目外，选修科目我选了实验科学。
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，