If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.
而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。
NATO says it will keep a reduced number of modern nuclear weapons to guarantee peace.
北约称将保持削减后的现代核武器数量以确保和平。
Whatever is left over may be put into the refrigerator, where it will keep for 2-3 weeks.
所有吃剩下的东西都可以放进冰箱，可保鲜2至3周。
We are very sorry about this but I'm sure you'll find the Seal Centre which is directly opposite it will keep you entertained.
我们对此感到非常抱歉，但我相信，大家会发现海豹中心（在它的正对面）也能让你们玩得开心。
It isn't much of a job, but it will keep the Wolf from the door.
那并不是一个什么了不起的工作，但靠它还能勉强度日。
It will keep transformation, dazzle you.
它会不停地变换，让你眼花缭乱。
Asda simply says it will keep undercutting all similar competitors by 10%.
艾思达公司只是简单地回应它的售价将保持比所有同类对手的价格低10%。
Second, it will keep your mom or dad aware of things going on in your school.
第二，它可以让你的父母了解到学校里都在发生着什么。
As a stimulant it will keep you awake, even if used nearly six hours before bed.
作为兴奋剂它会让你保持清醒，即使差不多是在睡觉前6个小时。
Even if your teachers told you NOT to read like this, it will keep you focused.
尽管你的老师告诉过你不要这样阅读，这会帮助你集中注意力。
If we have the faith that believes to see, it will keep us from growing discouraged.
若是我们也有“信得见”的信心，我们就不会灰心了。
When it is, it will keep track of all iterators and make sure that they are all valid.
当它实现时，它会跟踪所有迭代器，并确保他们都是有效的。
It will keep the rain off your face, which makes a huge difference to your comfort level.
会防止雨水滴到脸上，大大提高你的舒适度。
The fire from it will keep your soul from turning to ashes and your mind from turning to mush.
来自那里的火焰会阻止你的灵魂化为灰烬，防止你的思想变得一团糟。
It can try to move expectations by announcing that it will keep short-term rates low for a long time.
可以通过宣布它将长期保持短期低利率努力改变预期；
If the fear is deep and remains then it will keep the body in tension even after the fearful fact happened.
如果深入的害怕一直保留着，在令人恐惧的事情发生之后，身体仍然会处于紧张中。
While this method isn't near as much fun as the natural method, it will keep her living a long and wonderful life.
尽管这个方法不像大自然的方法那么生意盎然，但是将使得她过上长时间的安稳生活。
Wear a hat. A hat with a brim can be your best friend during a rainy run. It will keep the rain off your face.
戴一顶帽子。一顶带帽檐的帽子将会是你雨天跑步时最好的朋友，它可以帮你的脸挡雨。
It will keep the apple wedges from Browning about 50% longer than just tossing the wedges in a standard sandwich bag.
比起仅将苹果块放在三明治袋子里，这样可延缓苹果块变成棕色50%的时间。
The extended mission will get a one-month trial run, and if that goes well, it will keep observing until the end of January.
WISE望远镜的这个额外任务需要进行一个月时间的试运行，如果进展顺利，它将会一直保持观测状态直到明年一月底。
“You’ll produce more melatonin, ” says Dr. Jayabarathan. “It will keep you feeling quite well right through thosedark times.”
“早晨是最好的，这样不会干扰到睡眠，”Jayabarathan医生说，“这将使你在这段黑暗的时光保持相当好的状态。”
It's a knowing that wherever the money came from to begin with, it will keep on coming, because you can keep on creating it.
你也应认识到，因为你不断的创造，财富才会源源不断的从它该来的地方来到。
So when a massive star collapses in on itself, it will keep and keep collapsing until it gets to a point of infinite density.
所以当一个巨大的恒星自我爆炸，它将继续一直爆炸，直至到达无限密度的一个点。
Curiosity about the world around you, how it works and how you can understand it will keep your brain working fast and efficiently.
对周围世界充满好奇心将会使你的头脑敏捷而高效。
When you sit down, place a napkin on your lap. It will keep your clothes clean and can be used to wipe small crumbs from your face.
入座时，把餐巾平铺在大腿上。这样，餐巾可以保持你的衣服不被食物沾染，同时也可以用来擦拭脸上残余的食物碎屑。
It will keep the metadata and statistics of the run in the metadata repository, and keep the run still visible in the history of the rule.
这会在元数据库中保留运行的元数据与统计信息，并保持运行在规则历史记录中可见。
TYLASHIA JOYNER: "I will want to play in college because it will keep me in shape and it will help me stay focused and want to do something.
乔伊纳：“在大学里我还想打长曲棍球，因为它让我保持身材，还能帮助我在做事时保持专注与进取心。
Freeze your bottle and put it into Johnnie Walker Ice Pillar. It will keep your bottle cold and will allow you to extend your chilled relishing.
冻结你的瓶子，放入尊尼获加冰支柱。它将保持您的一瓶冷，将允许您扩展您的冰鲜回味。
Freeze your bottle and put it into Johnnie Walker Ice Pillar. It will keep your bottle cold and will allow you to extend your chilled relishing.
冻结你的瓶子，放入尊尼获加冰支柱。它将保持您的一瓶冷，将允许您扩展您的冰鲜回味。
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