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UVA rays can penetrate deeply into your skin and suppress your immune system. This increases the risk of wrinkling and age spots.

UVA能穿透你的皮肤，使免疫系统的功能下降，这就增加了长皱纹和老年斑的危险。

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The B-2 Spirit stealth bomber is one of the most survivable aircraft in the world. It remains the only long-range, large-payload aircraft that can penetrate deeply into protected airspace.

B - 2幽灵隐形轰炸机是世界上生存能力最强的飞机之一，也是唯一能深度突防的远程重型飞机。

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And DocuSign has managed to penetrate deeply into a number of vertical markets, among them consumer products, insurance, financial services, real estate, healthcare, manufacturing, and education.

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"Because of the shape of the coil, it can penetrate more deeply into brain, " says Hollander.

CNN: STORY HIGHLIGHTS

There is a trade-off, though: the shorter a beam's wavelength, the less deeply it can penetrate.

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