What's the main reason for the father teaching his daughters to wrestle?

父亲教女儿们摔跤的主要原因是什么？

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Until recently, the main reason for removing dams was to restore salmon runs, but it is now recognized that a more important reason to remove dams is that they are no longer safe.

直到近期，拆除大坝主要还是为了恢复鲑鱼的数量，但现在人们认识到，拆除大坝的一个更重要的原因是这些大坝已不再安全了。

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Human activity is the main reason for this, the United Nations (UN) said.

联合国表示，人类活动是造成这一现象的主要原因。

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But when the Berlin Wall fell and the Soviet Union dissolved in 1989, the western alliance's main reason for being disappeared.

VOA: standard.2010.06.11

It doesn't work that way for a variety of reasons, but the main reason is that you want some decisions to be made at each space between two cells.

这出于很多原因,但主要的原因是,在每个细胞间隙,都需要决定信息是否继续传递

耶鲁公开课 - 生物医学工程探索课程节选

Many St.John's students cited this unique approach as their main reason for coming to the College.

VOA: standard.2010.05.12

And captain Kumar Sangakkara admitted their top-order collapse was the main reason for their below-par performance.

BBC: Paul Collingwood eyes Australia World Twenty20 final

He believes the main reason for opposing the ban is the credibility of Cites.

BBC: Polar bear trade ban 'too close to call'

But compromise itself is the main reason for the projected increase in the budget hole.

FORBES: Don't Like The Deficit Projection? Blame The Tax Compromise.