他在牢房中找到了一根绳索，但这根绳索只有够他安全到达地面的长度的一半。

He found a rope in his cell that was half as long enough to permit him to reach the ground safely.

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因此，当我们考虑一个键的长度的时候，这就应该是我们的键长，这是合理的，因为体系会在核间距达到这一距离时，能量到达最小值。

So, when we think about a bond length, this is going to be the length of our bond here, that makes sense because it's going to want to be at that distance that minimizes the energy.

youdao

当考察队（哈多、安·丹尼斯和马丁·哈特利）长度跋涉的开局因为恶劣气候而被耽搁后，大家很快就意识到：到达极地是一项艰巨的挑战。

It became rapidly clear after the team (Hadow, Ann Daniels and Martin Hartley) was hampered by atrocious weather at the beginning of the trek that reaching the pole would be a challenge.

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