The population almost doubles in summer, mainly because of the jazz festival.

主要由于爵士音乐节的缘故，在夏季这里的人口几乎比平时多一倍。

《牛津词典》

The stock market scandal is refusing to go away, mainly because there's still no consensus over how it should be dealt with.

此次股市丑闻历久不散，主要是因为在此事如何处理上尚无共识。

《柯林斯英汉双解大词典》

I chose China mainly because I learned Chinese when I was young.

我选择中国主要是因为我年轻时学过中文。

youdao

She says this is mainly because men own most of the phones.

VOA: special.2010.05.03

I think that's mainly because Hollywood only ever chooses people with a very posh English accent.

我想，主要因为好莱坞只选那些有高傲的英式口音的人。

优雅的英式英语 - SpeakingMax英语口语达人

because the accent's very different from what we teach in South America mainly.

因为口音跟我们在南美主要教的口音很不一样。

巴西的英语老师 - SpeakingMax英语口语达人

Jay Carney was willing to discuss the programme this week, mainly because NBC News published the paper.

BBC: Viewpoint: US media lax on drones

Rebuilding, now feverishly under way, was slow to start, mainly because of delays in insurance payouts.

ECONOMIST: Repairing Canc��n after Wilma

This time the curve has become inverted mainly because long-term yields have fallen so much.

ECONOMIST: Bond bombshell