long focus length of lens 长焦距透镜焦距
In this experiment, we use two gratings with the same frequency to generate Moire fringes and use them to measure the long focus length of lens.
本实验是利用两块空间频率相同的黑白光栅产生的莫尔条纹来测量长焦距透镜的焦距。
The long length of life, most people focus too much on the life of frustration and suffering.
在人生的漫漫里程中，多数人过多地关注了生活中的挫折与苦难。
The cable is a very important member in the cable bridge, and its length is greatly increasing with the span of the bridge. The vibration control of a light and long cable is an attentive focus.
斜拉索是斜拉桥等索支撑结构中重要的受力构件，随着斜拉桥跨度的逐渐增加，拉索也越来越长，轻而长的拉索的振动控制问题也日益突出。
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