Without the protection of sunscreen, just a few minutes of daily sun exposure over the years can cause noticeable changes in how skin looks and feels, according to the American Academy of Dermatology.
根据美国皮肤学会的说法，没有防晒霜的保护，哪怕每天只有几分钟暴露在阳光下，经过一些年，皮肤的样子和感觉也会发生显著变化。
Without protection from the sun's rays, just a few minutes of exposure each day over the years can cause noticeable changes to the skin.
如果对阳光照射没有采取保护措施，那么只要每天暴露在阳光下几分钟，几年后就能对皮肤产生显著的影响。
The embedding strength is decided by the just noticeable difference of the image, and the cover image is not needed during the extraction of watermark.
水印的嵌入强度由图像的视觉临界差异决定，水印的提取不需要载体图像。
The embedding strength is decided by the just noticeable difference of the image, and the cover image is not needed during the extraction of watermark.
水印的嵌入强度由图像的视觉临界差异决定，水印的提取不需要载体图像。
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