Enamelum
釉質
??? 情景例句
Is that you, Susan?
是你嗎， Susan？
Does this radio belong to you?
這臺收音機是你的嗎？
To escape from the Earth in a rocket, one must travel at seven miles per second.
要乘坐一枚火箭飛離地球，火箭的速度要達到每秒7英里，