自1951年以来，在职的已婚女性的比例已经从刚超过五分之一增长到二分之一。

Since 1951 the proportion of married women who work has grown from just over a fifth to a half.

youdao

要是我选择一个60度的角，这些数就会是二分之一和二分之根号三。

If I pick an angle of 60 degrees, these are some numbers like half and root 3 over 2.

youdao

当今纸废料约占全部废料的二分之一。

Today, paper accounts for about half of the wastes collected.

youdao

So, shared electrons are the ones that are shared between the carbon and the nitrogen, so we have 6 shared electrons, and we want to take 1/2 of that.

共用电子是那些在碳和氮之间,被它们共用的电子，那么我们有六个共用电子，然后我们要给它乘上二分之一。

麻省理工公开课 - 化学原理课程节选

If I pick an angle of 60 degrees, these are some numbers like half and root 3 over 2.

要是我选择一个 60°的角,上面的系数就会是二分之一和二分之根号三

耶鲁公开课 - 基础物理课程节选

Then minus 1/2 of 2, because we only have one bond or 2 electrons in a bond.

然后减去二的二分之一，因为我们只有一个键，一个键就是两个电子。

麻省理工公开课 - 化学原理课程节选