Reason 4: Changeable covers.

理由4：可换的外壳。

youdao

Reason 4: Generic Support and Reason 5: Lambda Support

原因4：泛型支持和原因5：Lambda表达式支持。

youdao

Reason 4: A Mickey Mouse design is on the cover, and a Mickey leather case and a fancy strand are also included.

理由4：机盖上的图案是米老鼠，并配有一件米奇的皮革衣服及一条非常奇特的手机链。

youdao

I don't care how you do it on exams or on problem sets, but you do need to be aware that the 3 d once filled is lower in energy than the 4 s, and the reason you need to be aware of that is if you're asked for the electron configuration now of the titanium ion.

我不关心你们在考试或者,问题集中如何做它，但是你们的确需要知道3d一旦被填充,它的能量是小于4s的，你们需要知道这个的原因,是如果你现在被要求,写出钛离子的电子构型。

麻省理工公开课 - 化学原理课程节选

For this reason, around 4.5 million people ride the subway every day.

BBC: Subway systems by the numbers

There's a reason they're 4-0.

WSJ: Impact beat Red Bulls 1-0 to improve to 4-0

It is a big reason why they are a disappointing 4-4 heading into Tuesday's showdown with the Devils in Newark.

WSJ: The Rangers Are Being Overpowered