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With good water and dust proof functions;
具有良好的防尘、防水等性能；
youdao
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The front of the beam expansion system is also provided with a dust proof mirror.
在其扩束系统前面还设有一个防尘镜。
youdao
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The front of the beam expansion system is also provided with a dust proof mirror.
在其扩束系统前面还设有一个防尘镜。
youdao