Self-confidence means being relaxed enough to allow your lover their personal space.

自信就是放宽心，给爱人足够的私人空间。

《柯林斯英汉双解大词典》

Water ice could enable the creation of a self-sustaining moon base someday, a mining camp perhaps, or a departure point for further space exploration.

某天水冻冰块可能会创造一个自给自足的月球基地，也可能是采矿营地，或者是更远的太空探索的起点。

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Would you like to live in a city where buildings turn the lights off for you, and self-driving cars will find the nearest parking space themselves?

你愿意住在这样一个城市里吗？那里的建筑物会为你关灯，而自动驾驶的汽车会自动找到最近的停车位。

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In many cases, REIT earnings exceeded Wall Street's expectations, with owners of high-end shopping malls and self-storage space posting the largest gains.

WSJ: Malls, Self-Storage Led REITs in First Quarter

In fact, ZoomCar could, if it grows fast enough and markets cleverly enough, carve an impressive slice of the self-serve car rental space in a country where 300 million live in metropolitan regions.

FORBES: Attacking A $3 Billion Rent-A-Car Market

In fact, Tesla and Musk, a self-made billionaire whose Space X startup is privatizing space travel, would seem to be poster children for the type of entrepreneurialism Romney says he seeks to unleash.

FORBES: Memo To Mitt: Tesla Is Not Solyndra