It's mostly because the team have improved.

这主要是因为球队进步了。

youdao

This is mostly because they aren't uniform in structure.

这主要是因为它们在结构上不一致。

youdao

But that is mostly because of luck, and luck does not last.

但是这很可能是因为侥幸，而幸运总不会长久。

youdao

The study found that the main shoot grows the best of all not because of its position at the top of the plant, but mostly because it got there first.

VOA: special.2009.10.13

And the reason for this was mostly to, because we realized that the people around you, at your school, are the people who you want to look at mostly anyway.

这样做的原因主要是，我们发现，人们更乐于去了解同校生,或者身边的人的信息。

斯坦福公开课 - 扎克伯格谈Facebook创业过程课程节选

because it's in the morning, and, you know, we learn, but we mostly just have a conversation,

因为这个课在早上，而且虽然是学习，但其实大部分时间都是在练习对话。

学习外语的原因 - SpeakingMax英语口语达人

But mostly because we'd regain contact with old friends and make some new ones.

CNN: ASIANOW - TIME Asia | Davos 2000: So Long, Farewell

But I like Apple's take even better, mostly because of that slide-out right-hand panel.

CNN: Review: Mac's Lion adventure continues

Yet it's not as profitable as it could be, mostly because engineering costs remain too high.

FORBES: Needed: Butt Kicker