Senate rules require three fifths, sixty senators, to vote to end the debate.

参议院规则要求五分之三，即60名参议员投票结束辩论。

The ammonia has indeed moved through about three fifths of the tube.

氨确实已经通过大约五分之三的管子。

The southern states would not have signed the Constitution without protections for the “peculiar institution, ” including a clause that counted a slave as three fifths of a man for purposes of congressional representation.

如果没有对于这种" 特殊制度" 的保护，南方各州不会同意签署宪法。这种特殊的制度保护包括：在国会代表人数中一个奴隶可以算作五分之三个公民。