It can be easy to overdo it on the road, which combined with the regular rigors of travel can really wipe you out.

在旅行中很容易太卖力，再加上严格执行旅行计划，可能你就累垮了。

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Most of the premature births occur in Asia and Africa, which combined accounted for an estimated 11 million in 2005, the latest year that global data on the problem are available.

大多数早产儿出现在亚洲和非洲，这两地2005年的早产儿合计约为1,100万，这是目前反映全球早产儿问题的最新数据。

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Other particles within the disk collided and stuck together to form asteroid-sized objects named as planetesimals, some of which combined to become the asteroids, comets, moons and planets.

其它在盘状星云中的物质相互碰撞合并，形成小行星尺寸的星体，称为“星子”，一些星子相互结合，形成小行星、彗星、卫星和行星。

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which combined Atkins' country picking and Paul's jazzy,electric style.

VOA: standard.2009.08.14

So you can think about how these 2 things combined are going to be electronegativity, which is a measure of how much an atom wants to pull electron density away from another atom.

因此你可以想象出,这两样性质合起来就是电负性，也就是一个度量，关于一个原子,有多希望把另一个原子的电子密度拉过来的。

麻省理工公开课 - 化学原理课程节选

Its largest markets are the U.S. and Japan which combined accounted for 64% of net sales last fiscal year.

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RFK's 1968 presidential bid, which combined vocal opposition to an unpopular war with a telegenic focus on alleviating poverty.

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But if you've smoked, and then stopped there is irreversible damage, which combined with age-related decline can significantly affect their quality of life.

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