To liberate our country, they devoted their lives.

为了解放祖国，他们献出了生命。（不定式短语作状语）

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Because Zen monks for hundreds of years have devoted their lives to being present in everything they do, to being dedicated and to serving others.

是因为数百年以来，“禅僧”们献身于在他们所做事情以及服务为众生当中。

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They have devoted their lives and sacrificed the lives of the people under them to protect the property and freedom of those citizens and feel compelled to maintain the military machine that they drive.

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They took on those challenges and ran those experiments and devoted their lives to expanding the reach of human understanding.

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