以下为句子列表：
英文: Even if experimenters bounce the beams to and fro to increase the effective length of an interferometer's arms to more than 100 kilometres, the expected difference in length between the two beams' paths still amounts to less than a hundred-millionth of th
中文: 尽管已经让激光束反复反射来使激光干涉管臂的有效长度增加到超过了100公里，但在光路路程之内，两束光波长差仍小于氢原子直径的一亿分之一。
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英文: This paper analyzes the effective length factor (k) in the eccentrically connected cleats in hollow section connection.
中文: 介绍了在钢桥连接系采用空心截面杆件时,连接系与主梁的连接问题中,偏心连接板有效长度系数的分析和确定。
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