在实验中就要测定单摆的摆长，然后测定此摆长时的振动周期。

So in experiment we should measure the length of single pendulum, then get the period of oscillation in this condition.

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通过单摆装置可以方便地研究单摆的振动周期与摆长关系和测定当地的重力加速度。

Using the single pendulum, we can research the relationship between the period of oscillation of it and the length of it and measure local acceleration of gravity.

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惊闻中国华东地区山东省济南市有数千居民都观摩了拖地裙摆长达331英尺的婚纱。

Thousands of residents in Jinan, east China's Shandong Province, have turned out to see a bridal gown with a train measuring 331 feet in length.

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