The teacher asks: "If a cup replete water, cover with a piece of scrip cup, next convert comes over, what situation can you produce? What situation can you produce??
老师问：“如果把一只杯子装满水，用一张纸片盖住杯子，然后倒置过来，会发生什么情况呢？”
Classmates are eristic in succession: Some come saying that the water in the cup can be poured out of, some saying that the scrip can fall down, return some saying that the scrip is met to soak and be fallen down together with water by water...
同学们议论纷纷：有的说杯子里的水会流出来，有的说纸片会掉下来，还有的说纸片会被水浸湿并与水一同掉下来……
The teacher shakes his head, then I come home should do this with one's own hands small experiment. Bout is excellent, I made this test with respect to ground of too impatient to wait, press a demand, I make good test preparation: Look for a glass, according to the size of cup mouth, sought the paper of a piece of level off, cut to compare the scrip with a few bigger opening a little, received with glass full, a cup of clear water. All be all set, the experiment began.
老师摇了摇头，于是我回家要亲手做这小实验。一回到家，我就迫不及待地做起了这项实验，按要求，我做好实验准备：找来一支玻璃杯，根据杯口的大小，找来了一张平整的纸，剪了一个稍微比瓶口大一些的纸片，用玻璃杯接了满满，一杯清水。一切准备就绪，实验开始了。
I put the scrip that has cut on the cup mouth of glass first, let scrip and cup closemouthed be stuck closely together forcibly; Then, I take a glass with left hand, the right hand presses cup mouth scrip, next, both hands cooperates, come over cup apace convert; Finally, unlock the right hand slowly, at this moment, the miracle appears -- the water in the cup did not stay, scrip resembling was applied blackart is same, stalled water.
我先将剪好的纸片放在玻璃杯的杯口上，用力让纸片与杯口紧紧地贴在一起；接着，我用左手拿起杯子，右手按住杯口纸片，然后，双手合作，把杯子快速地倒置过来；最后，把右手慢慢放开，这时，奇迹出现——杯子里的水没有留下来，纸片像被施了魔法一样，把水拖住了。
Finish experiment, is I want to know who used glamour to paper? Checked a data to just know, the exterior tension of original water makes cup and paper close completely rose, right now, the water in the cup is less than the air pressure outside the cup to the pressure of the scrip, because this air pressure helps us,stalled water.
做完实验，我想知道是谁给纸施了魔法？查了资料才知道，原来水的表面张力使杯子和纸完全闭合起来了，此时，杯子里的水对纸片的压力小于杯子外的大气压力，因此大气压力帮我们拖住了水。
Ha, original scrip is by atmosphere force used glamour! Is this very interesting?
哈哈，原来纸片是被大气压力施了魔法呀！这是不是很有趣呢？