Optimum line length of sight 最佳视线长度
There certainly were tears in his when, at length, having watched the train out of sight, he turned round.
而最终当他目送列车驶出视线，转过身时，他眼里也噙满了泪。
The boat that now arrived, assured by the answering signal that all was well, soon came in sight, white and silent as a phantom, and cast anchor within a cable's length of shore.
那艘帆船还是等在外面，在观察回答的信号究竟对不对，不久，它就静悄悄地驶近了，只见白朦朦的一片，象是一个幽灵似的，在离岸一箭路以外抛了锚。
The removable glass case even cleverly filters light on a special "orange" wave length, which is used by the insects for sight.
可拆卸的玻璃可视窗甚至能巧妙地过滤能被昆虫辨识的“橙色”波长。
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