奥巴马是在穿梭于截然不同的世界之间成长的，他学会如何在黑与白、异乡与美国、富与贫之间穿梭自如。

Barack Obama grew up learning how to slip in and out of different worlds - black and white, foreign and American, rich and poor.

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贫燃料与富燃料爆炸气体中，由管道底部向上，其电导性是逐渐增大的。

But in the fuel lean and fuel rich explosive gas, the electrical conductivity increases gradually from bottom to top.

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同时涌现出的“富二代”与“贫二代”在中国心理测试媒体间引发了热议。

The simultaneous emergence of the " rich second generation " and " poor second generation " has triggered a heated debate in the Chinese media.

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