A proton contains three charged quarks bound by the strong force and its radius is defined as the distance at which the charge density drops below a certain value.

一个质子由三个带电的夸克通过强相互作用力结合而形成，它的半径是由电荷密度降到某一确定值的距离来确定的。

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Modern poetry through the old style poetry metrical bound, the language is colloquial and prose style, the language of prose and shortening the distance, but still has its own characteristics.

现代诗歌冲破了旧体诗的格律束缚，语言趋于口语化、散文化，其语言与散文的距离缩短，但仍具有自己的特点。

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This paper is concerned with the special case in which the minimum distance equals the BCH bound.

本文考虑的是极小距离等于BCH界的特殊情形。

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Prime Minister Singh said the United States and India are separated by distance but bound by common values.

VOA: standard.2009.11.25

Although we're quite a distance away from any of those muscle-bound ideas becoming everyday realities, it's good to at least see them on the horizon.

ENGADGET: Turing machine built from artificial muscles may lead to smart prosthetics

And though these countries may be a great distance from our shores, we know that our own future is bound to this region by the forces of economics and security, by history and by faith.

WHITEHOUSE: Moment of Opportunity: American Diplomacy in the Middle East & North Africa | The White House

During periods of low volatility, this distance will contract, which allows us to better identify a range-bound market.

FORBES: Gain an Edge with Volatility Analysis