-
(单词翻译:双击或拖选)
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.
In theory, scientists could learn a lot about our health by testing tiny amounts of bodily fluids—a drop of blood, a tear, a bead1 of sweat. But something this small is easily contaminated by other liquids or surfaces. So what are scientists doing? They're making liquids bounce, dance, and float lightly through the air. Researchers from Belgium's University of Liege published their findings November 18th in the New Journal of Physics.
Usually droplets2 on a surface of oil eventually just collapse3. Something called acoustic4 levitation5 was introduced a few years ago, but it takes a lot of complex equipment. Then one researcher noticed something strange. Certain bass6 notes booming from his iPod could make droplets dance and roll around. He and his colleagues pursued this line of inquiry7.
They figured out the appropriate vibrations8 that make the droplets lightly bounce. This keeps them separate from the oily layer underneath9. The result looks as if the drops are rolling around. And the drops haven't had a chance to mix with the fluid below. Researchers say the technique could be used to manipulate tiny amounts of fluid without contamination. Yet another reason why iPods are essential pieces of lab equipment.
Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.
1 bead | |
n.念珠;(pl.)珠子项链;水珠 | |
参考例句: |
|
|
2 droplets | |
n.小滴( droplet的名词复数 ) | |
参考例句: |
|
|
3 collapse | |
vi.累倒;昏倒;倒塌;塌陷 | |
参考例句: |
|
|
4 acoustic | |
adj.听觉的,声音的;(乐器)原声的 | |
参考例句: |
|
|
5 levitation | |
n.升空,漂浮;浮起 | |
参考例句: |
|
|
6 bass | |
n.男低音(歌手);低音乐器;低音大提琴 | |
参考例句: |
|
|
7 inquiry | |
n.打听,询问,调查,查问 | |
参考例句: |
|
|
8 vibrations | |
n.摆动( vibration的名词复数 );震动;感受;(偏离平衡位置的)一次性往复振动 | |
参考例句: |
|
|
9 underneath | |
adj.在...下面,在...底下;adv.在下面 | |
参考例句: |
|
|