其内部的荧光层，可起到导航的作用；还可改变其颜色作为专用标志之用。
A fluorescent layer arranged in the inner part can play the navigational function, and the color can be changed as a special mark.
其内部的荧光层，可起到导航的作用；还可改变其颜色作为专用标志之用。
A fluorescent layer arranged in the inner part can play the navigational function, and the color can be changed as a special mark.
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