Tetraprotic acid
[化] 四元酸
🧩 词语组成解析
🗣️ 情景例句
My pleasure, Son.
不客气，儿子。
Where were you yesterday afternoon?
你昨天下午在哪儿？
The vicar has been asked to have the tree cut down, but so far he has refused.
人们曾请求教区的牧师叫人把树砍掉，但他直到现在也没有同意。