Pentendioic acid
[化] 戊烯二酸
🧩 词语组成解析
🗣️ 情景例句
You are a terrific instructor, Jack.
你真是个了不起的教练 Jack。
When are you off?
你什么时候动身？
but custom, we have a way of thinking, is behaviour at its most commonplace.
至于风俗呢，只是些司空见惯的行为而已。