剩下的森林是世界上一半物种的家园，因此成为它们生存的主要资源。

The remaining forests are home to half of the world's species, thus becoming the chief resource for their survival.

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她在战争期间遭受营养不良的折磨，因此成为一名职业舞蹈演员对她身体的要求太高。

She suffered from inadequate nutrition during the war, and therefore a career as a professional dancer would have been too demanding on her body.

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他们因此成为国家英雄。

For doing this, they became national heroes.

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So the nature of the world, post-cold war world is increasingly one about competition for markets, govern of one nation's markets.

因此冷战之后，市场的竞争,成为世界的主题，一国市场的管理，如果事实如此。

麻省理工公开课 - 媒体、教育、市场课程节选

By 1860 there were approximately 4,000,000 slaves in the United States, the second largest slave society slave population--in the world.

截至1860年,美国大约有,四百万的奴隶,也因此使之成为了,世界历史上的第二大奴隶社会

耶鲁公开课 - 美国内战与重建课程节选

Yeah, so also 4. We started with 10 valence electrons, we used up 6 of those as bonding electrons, so we have 4 left, which will be lone pair electrons.

对，也是四个，我们从十个价电子开始，只用了六个来成键，因此我们还剩下四个，它们将成为孤对电子。

麻省理工公开课 - 化学原理课程节选