仅在三年前，中国还是煤炭净出口国。

Only three years ago China was a net coal exporter.

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国际货币基金组织认为，到2016年，这三个国家的净负债与GDP之比都将下降，而美国的债务率则会上升。

The IMF thinks that in all three the ratio of net debt to GDP will be lower in 2016 than today. In America it will be higher.

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他三下五除二地冲净了带有斑点的鱼鳞以及里面鲜红的鱼肉，然后把鱼包裹在纸里，再放进一个塑料袋。

He rinsed the flecked mesh of scales and the red flesh inside, then wrapped the fish in paper and put it in a plastic bag.

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so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选