英语中的三分之二：two third、two-thirds与two third在用法上有区别吗？:-)

英语中的三分之二：two third、two-thirds与two third在用法上有区别吗？:-)

由于英语的普遍很多人对
two-third 和 two-thirds 的区别不清楚。
two-thirds
four-fifths
等等
是名词，并以复数形式来用，比如
Two-thirds of the people present agree with the resolution.
但是，如果 “三分之二”是形容词， 我们用单数形式 two-third 来修饰接下的名词，比如：
The voting for this resolution uses the two-third rule.

下面例句同一句子里 two-third 和two-thirds两个兼用：

The rule governing train speeds stipulates that on certain tracks,
the two-third rule applies to freight trains. It means that the speed limit for
a freight train is automatically two-thirds of the speed for passenger trains.

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two thirds只有这种说法是正确的
或者2 quarters也可以

two third错误

two-thirds与two thirds 说法是正确的。没有区别。连字符可加可不加。two third表达错误
这是分数的表达方式。
分子式基数词，分母是序数词
当分子是1时，分母单数
当分子大于1时，分数复数。如two-thirds与two thirds