Tetrachlorobenzene
[建] 四氯苯
??? 情景例句
It's natural.
這是很自然的。
How have you been?
你過(guò)的還好嗎？
He did not look up from his desk when I entered.
我進(jìn)去的時(shí)候，他連頭也沒(méi)抬。