But a drop in oxygen levels can cause a health emergency in people with heart or lung problems.

VOA: special.2009.07.14

Similarly we see as we go down the table, so as we're going from one row to the next row, so, for example, between helium and lithium, we see a drop; the same with neon to sodium, we see a drop here.

同样地，我们来看看沿着周期表往下走，当我们从一行到下一行时，比如，从氦到锂，我们看到了一个下落;,从氖到钠也一样，我们看到这里有个下落。

麻省理工公开课 - 化学原理课程节选

so it's... pretty near finals. So you can drop any classes you want up until the drop date with like no penalty.

所以……蛮接近期末考试的。所以在退课日之前你可以不受任何处罚退课。

对于返校日 - SpeakingMax英语口语达人

"Are there people in the world with the foolishness to die because leaves drop off a vine?

VOA: special.2009.08.01

I think of it as a kind of reply to that famous question in "Leda and the Swan"; that is, "did she put on his knowledge with his power before the indifferent beak could let her drop?"

这是对丽达和天鹅中那个,著名问题的回答，在那冷漠的嘴把她放下之前,她是否用她的力量获取了他的知识？

耶鲁公开课 - 现代诗歌课程节选

Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.

VOA: special.2009.04.21

So this is our final equation, and this is actually called the Balmer series, which was named after Balmer, and this tells us the frequency of any of the lights where we start with an electron in some higher energy level and we drop down to an n final that's equal to 2.

把2代入到这里，所以得到1除以,这就是我们最终的方程，这叫做Balmer系，以Balmer名字命名的,它告诉我们从高能级掉到n等于2的,最终能级所发出光的频率。

麻省理工公开课 - 化学原理课程节选

"I don't really do a whole lot. I normally just spend time with family, go out to eat,hang out, wait for the ball to drop on TV."

VOA: special.2009.12.28

Being so caught up, So mastered by the brute blood of the air, Did she put on his knowledge with his power Before the indifferent beak could let her drop?

就这样被征服，这样被天空中野性的血液欺凌，她是否借他之力获得了知识,在那一意孤行的嘴放她下来之前？

耶鲁公开课 - 现代诗歌课程节选

Drop the seeds over the surface and cover them lightly with soil.

VOA: special.2009.04.28

The runway is built on a flat stretch of land on a hill, with a sheer drop on both sides.

VOA: standard.2010.05.23

But many experts say Mr.Saakashvili's drop in popularity over the years indicates a strong disillusionment with the achievements of the Rose Revolution.

VOA: standard.2009.09.01

With competition, experts expect prices to drop, making smartphones much more accessible to consumers around the world.

VOA: standard.2010.06.25

News of the widening trade gap, along with several other gloomy economic reports, contributed to a 2.5 - percent drop in the Dow Jones Industrial Average on Wednesday.

VOA: standard.2010.08.11

Family members rush to take advantage of every precious drop before the afternoon, filling plastic jugs,oil drums, and pails with water for use by the 15 people who live in this home.

VOA: standard.2009.08.01

Last week saw positive U.S.economic news, with increases in home sales and housing prices, a jump in manufacturing activity, a drop in new jobless claims, and a new growth figure showing the economy shrinking far less than had been anticipated.

VOA: standard.2009.08.02