You need a seat which supports your back and the book should be at the right distance from your eyes.

你需要一个能支撑你背部的座位，书本应与你的眼睛保持适当的距离。

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For instance, a planet has to be just the right distance from the star it revolves around.

比如说，行星与其所围绕旋转的恒星之间的距离是否适当。

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You need to maintain the right distance between your viewing area and your television screen.

你需要去保持正确的距离在你观看区域和你电视萤幕之间！

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In other words, if you look too closely at a picture or if you stand too far away from it you don't see it clearly it's out of focus but if you achieve just the right distance from it, it comes into focus.

换句话说，如果你站得离一幅图画太近,或太远都无法看清它,它在焦距之外,但是如果你站在合适的位置上，焦距就对准了，画就清晰了。

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Then maybe and then maybe some kind of melody will come in and then it'll all come together right in front of you and it'll kind of disappear in the distance.

然后可能,可能会出现些旋律,然后它们一起出现在你面前,并一起消失在远方

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Of course, just because a planet is the right distance from its star does not imply that it will host life.

ECONOMIST: Extra-terrestrial life

And how do I stay the right distance from the edge?

NEWYORKER: Mastering the Machine

"The climate has to be right, the distance not too far, the commuter's health not an issue, a lack of fast, simple, reliable and safe public transportation needs to exist, " Joshua Wertheim said.

CNN: Drivers, cyclists square off on sharing the road