Barack
n. 巴拉克（男子名）
🗣️ 情景例句
Aren't you hungry, Harry?
你不饿吗， Harry？
Do you usually do arithmetic on Sunday?
你通常在星期日做算术吗？
only of metal, which wears away by friction.
而是由金属组成，而金属可以随着磨擦而磨损殆尽。