Piperonylic acid
[化] 胡椒基酸; 3,4-亚甲二氧基苯甲酸
🧩 词语组成解析
🗣️ 情景例句
and photograph street performances in the city,
拍摄城市 的街头表演，
Opportunity only knocks once.
机不可失，时不再来。
I think we can do that.
那我想没问题。