Amaron
[化] 苦杏堿; 四苯基吡嗪
??? 情景例句
Susan, I understand you're in the toy business. Susan
聽說 ，是在玩具業(yè)工作。
Whom are you calling?
你要找誰？
Are you ready to sign?
準(zhǔn)備好可以簽名了嗎？