Over time, unprotected exposure can contribute to cataracts, as well as cancer of the eyelids and the skin around the eyes.
长时间毫无保护的眼部暴露会导致白内障，或者一种眼脸和眼部周围皮肤可得的癌症。
This means that exposure time can be extremely short even in poorly lit conditions.
这意味着，即使在光线并不足的条件下，曝光时间仍然可以极短。
This way, any vibrations induced by the mirror have time to settle down before the exposure begins.
由此，镜面翻转造成的震动就有时间在曝光开始前缓和下来。
The researchers believe that the sunburns will worsen over time, due to increased ultraviolet radiation exposure.
研究人员相信灼伤会因为紫外线照射的暴露，随着时间而恶化。
So continuous exposure over time could leave substantial amounts of inflammatory particles in the brain, he speculates.
因此，长时间持续接触污染物会使得大量致炎粒子停留在脑部，他推测道。
It has a wide-aperture lens to capture as much light as possible, and the technology requires no clunky auto-focus mechanism. It adjusts exposure time automatically.
它的大光圈镜头可以摄入尽可能大的光量，所用技术并不需要笨重的自动对焦系统，曝光时间也是自动调节。
You could use a tripod and a long exposure time.
你可以用三角架，并加长曝光时间。
Get enough sun exposure, he says, and skin will wrinkle long before its time.
在阳光下暴露足够久，皮肤的皱纹就会出现得早得多。
A long exposure time captured stars in this photo-and the brief balanced light from both a fading moon and a brightening eastern sky.
长时间曝光捕捉到照片中的星星，以及淡出的月亮和明亮的东部天空短暂的平衡光。
A long exposure time captured stars (seen as white flecks in the sky) and the exceptional light in this image.
长时间曝光捕捉到图中的那些星星(空中白色的斑点)和特殊的光。
The long exposure time required for moonlight photography often means that the moon may have moved significantly over the course of the exposure.
夜间摄影需要长时间曝光，这就意味着月亮可能会在曝光期间有很明显的移动。
Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.
通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。
Photos are unavoidably limited by the trade-off between depth of field, exposure time and image noise.
你必须在景深、曝光时间和噪点之间做出权衡。
You will be exposing both the lightning and the foreground and background when you are taking these pictures. The ambient light will determine your exposure time.
在曝光时你要照顾到闪电和前后景，周边的光线会限制你的曝光时间。
with repeated exposure over time, you cross that threshold, and your body reacts.
但反复长时间暴露在这些过敏原中，你便超越了那个界限，身体便会有所反应。
The only proven biological effect of radiation at Chernobyl was an increase in thyroid cancer among those who were children at the time of exposure.
托马斯（Gerry Thomas）指出，切尔诺贝利核扩散可能增加儿童甲状腺癌症发生率的风险性预测，唯一能得到生物学效应证明的只是那些当时直接暴露在核辐射下的儿童。
Poor outcomes are largely related not only to dosage but to a woman's stage of pregnancy at the time of exposure; first and second trimesters are of the most concern.
缺陷在很大程度上不仅取决于照射的剂量还取决于孕妇阶段所受到的照射。最初的三个月和其后三个月是最重要的阶段。
Or maybe we’re somehow transformed over time by our darkened working environments and exposure to computer screen radiation.
也许我们某种程度上就是被漆黑的工作环境和电脑辐射慢慢变得奇怪的。
The exposure time was 114 minutes.
曝光时间为114分钟。
Reducing the time spent in sunlight helps minimise exposure to UV radiation, which creates free radicals known to damage and age tissues prematurely.
阳光下活动减少意味着暴露于紫外线辐射的时间缩短，而紫外线辐射会生成自由基，对机体造成损害并加速组织衰老。
In people, XPA is at prime DNA-repairing levels in the morning, which thus looks the safest time for UV exposure.
对人来说，XPA的DNA修复水平在早晨最好，因此早晨看起来是日光浴的最安全时段。
A full moon can be a savior for reducing the required exposure time and allowing for extended depth of field, while a moonless night greatly increases star visibility.
满月可以帮你减少曝光时间、扩大景深，而月光暗淡的夜晚增加了星星的可见度。
The prolonged exposure to these free radicals over time will cause progressive vicariations, which lead to cellular damage and eventual joint destruction.
随着时间的推移，这些自由基会造成渐进损害，最终导致细胞伤害，破坏关节。
Captured in this 60 second time exposure made on April 14, a yellow-tinged Mars and M44 are near the center of the field, seemingly just beyond the reach of a pine tree.
这张曝光60秒的照片摄于4月14日，微黄色调的火星和M 44接近视场的中心，看似就在松树的顶端之外。
Under those conditions photographers shoot with a fast exposure time and small aperture. That makes it impossible to capture faint objects in a dark background, such as stars.
在这种情况下拍摄者会使用很短的快门时间并调小光圈，这样就不可能拍摄到黑色背景上那些很暗的物体，如星星。
Under those conditions photographers shoot with a fast exposure time and small aperture. That makes it impossible to capture faint objects in a dark background, such as stars.
在这种情况下拍摄者会使用很短的快门时间并调小光圈，这样就不可能拍摄到黑色背景上那些很暗的物体，如星星。
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