Tetraoxide
四氧化物
??? 情景例句
... my slogan is I care.
……我的口號是， 我關心 。
You haven't sold your product in our country so far, have you?
到目前為止，你們的產品尚未在我們國家銷售，是嗎？
They have to work hard to support their family.
他們必須努力工作來支持他們的家。