second某事的意思是支持一个提议或想法。
Formally, in a meeting when someone suggests or proposes an idea, there needs to be a “second” (someone else who supports the motion) for discussion to take place that results in a vote. Without a “second” the idea or motion dies and is not considered.
正式地说，在会议上，当有人提出一个建议或想法时，需要有第二个人(支持该动议的其他人)进行讨论，然后进行投票。没有second的想法或动议则不被考虑。
Informally, if people are just talking in a group and someone has an idea or makes a point about any particular subject, someone else in the group may say, “I second that”, meaning that he/she supports the idea and agrees with what was said.
非正式地说，如果人们只是在一群人中交谈，有人对任何特定的主题有一个想法或提出一个观点，这个群体中的其他人可能会说，I second that，意思是他支持这个观点并同意所讲的内容。
例：
A：How about pizza for dinner?
今晚吃披萨怎么样?
B：I second that!
我同意。
The motion was proposed by the club's chairwoman and seconded by the secretary.
该动议由俱乐部女主席提出，由干事附议。
"I could use a drink." "I'll second that (= I agree with you)!"
“我想喝杯饮料。”“我赞成!”
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