It is easy to change a light bulb, sure, but it is harder to change the bulb and its fixture.
换一个灯泡当然很容易，但是要更换灯泡和其固定装置就比较难了。
I am sure you all know from physics class about how light moves in microscopic ways and that we can only see light when the wavelength of that light is in a specific range.
我相信，你们在物理课上都学过光是如何以微观的方式运动的，以及只有在光的波长在特定的范围内时我们才能看到光这一事实。
If you must fly, be sure to pack light to cut down the plane's load.
如果你必须坐飞机，一定要轻装上阵，减少飞机的载重。
Sure enough, this light was bent by the mass of the sun, confirming Einstein's theory.
肯定是光因太阳的质量而出现弯曲，这证实了爱因斯坦的理论。
You will often find yourself alternating between low light and daylight, so make sure you reset the ISO to the lowest setting immediately after you have finished shooting at a higher sensitivity.
你常常会在微弱光线和日光下变换拍摄，所以当你用高iso值拍摄完毕后，一定不要忘记马上把它调回最低值。
This has its downside, to be sure, but it does mean the for-profits are light on their feet and able to adjust to changing job-market needs.
当然，这有它的弊端，但是这也就意味着营利性大学没有那么多牵绊，可以从容地做出改变去适应劳工市场的需要。
Pay attention to light conditions. If the space receives maximum daylight, then make sure you shelter your plants from the excess sun and water them regularly.
注意光照条件。如果空间光照充裕的话，你得看好植物以免受到过多的光照并且要定时浇水。
Just make sure you keep your robot as light as possible, and get motors that can do overkill.
让你的机器人尽可能的轻，选一个不容易被烧坏的电机。
I like the Canon 50mm 1.4 or 1.8 (I'm sure there is a comparable Nikon) a faster standard lens will allow you to take great food shots when you are indoors or when less light is available.
很多时候被误解为对焦快的镜头-_-我个人喜欢佳能50毫米定焦1.4光圈或者1.8光圈镜头。尼康也有相同型号标准高速镜头可以在室内或低光条件拍摄时，提供高品质的图像。
I'm not sure that one would call this work creative in light of the components given by Csikszenthmihalyi.
我不确定的是，根据csikszenthmihalyi所给出的组成，是否会称这样的工作为创造性的。
Make sure the DE-Light Gateway and DE-Light Client components are installed.
确保已安装了DE -Light网关及DE - Light客户端组件。
Be sure to be back in your rural idyll for sunset and then the evening light show; it can be dazzling, especially for those who live in a city.
确保太阳落山前回到你的田园生活中去，然后晚上的灯光表演就开始了，这个表演让人眼花缭乱，特别是对那些城市人。
He turned off their light and made sure their bedroom door was open exactly as wide as they wanted it.
他关掉她们的灯，确保她们卧室的门打开的幅度恰是她们想要的。
And, no matter what, make sure you buy a light laptop you can lug around easily.
其次，无论如何，确保你买了一个可以方便携带的轻便笔记本电脑。
If your family does insist on light colors with children, be sure to dress them just before the photo is taken.
所以，如果你的家庭坚持穿浅色服装和孩子们拍照，那么确保在拍照的前一刻给孩子们换上衣服。
To make sure that the cameras are accurately recording small changes in reflected light, engineers look for a bright light against a dark background to provide a reference point.
为了确保相机准确地记录来自反射光的细微变化，工程师寻找暗背景上的亮光，来提供一个参照点。
But I'm not sure I buy the rest of the arguments, i.e. should be clearly visible from space, should not be light/shadow assisted etc.
不过对于其他的论点我可不买账，比如说要在太空中清晰的看到长城，或者不能用光影效果辅助等。
Sure, it can take some time for this to happen, but if you persist, employees will see the light and it will be worth the wait.
当然，这些成为现实尚需时日，但只要你坚持不懈，就会获得员工的赞同，等等也物有所值。
Light campfires only in established fire rings and be sure they're completely extinguished before you leave.
点燃营地的火焰时候请选择原有的篝火圈的地方，而且在离开的时候确认火被完全熄灭。
Dark backgrounds are very effective, but be sure to make text a light color for easy reading.
暗色背景非常有效，但为了易读要确保内容是亮色的。
"I - like every other taxi driver in Sofia - stop at a green light to make sure nothing is coming the other way," he said.
“像索非亚的其他出租车司机一样，我会在每个绿灯亮起后停在哪里，确认其他车道上没有什么东西冲过来之后才会驶过路口”，他说。
Make sure you are using your computer in a properly lit room, and take note that "properly lit" does not mean blinding light.
确保在光线充足的房间使用电脑，注意，“光线充足”并不是指光线刺眼。
Make sure that your blinds can block out any light that might come in, and that your room stays at a comfortable temperature.
确保你的窗帘能阻隔任何光线进入，室内温度适宜。
Be sure to use flash for action shots or they're likely to come out blurry, even in the best light.
记得用上闪光灯，即使在最好光线下，动作下的镜头都可能模糊。
Also, make sure that your screen is at a 90-degree Angle to any light source to cut down on glare.
同时，确使你的屏幕对任何光源都保持90度角来减少光的强度。
Make sure your glasses have both UVA and UVB protection and that they block light from the top and sides.
你的眼镜要能防uva还能防uvb，眼镜的上面及两边都不能透光哦。
Be sure to watch the video below for an additional bonus trick to add a dreamy window light effect to these shots.
请观看一下的视频，另外还有额外的增加梦幻的窗户光的小技巧！
x-heights. If you make a light weight and the black weight of one typeface you'll have to make sure that the black weight has a bigger x-height than the light weight (top line drawing).
如果你制作一个包含轻磅（细线体）和重磅（粗黑体）的字体，你应该确保粗黑体的x高度比细线体的略大（见图中上一行）。
x-heights. If you make a light weight and the black weight of one typeface you'll have to make sure that the black weight has a bigger x-height than the light weight (top line drawing).
如果你制作一个包含轻磅（细线体）和重磅（粗黑体）的字体，你应该确保粗黑体的x高度比细线体的略大（见图中上一行）。
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