This afternoon, there is a bag of thing to come to the classroom in teacher hand, classmates ask questioningly: "Teacher, what is what you take? " teacher uncannily says: "You know after a while! "You know after a while!!
今天下午，老师手里提着一袋东西来到教室，同学们都疑惑地问道：“老师，您拿的是什么呀？”老师神秘地说：“你们待会儿就知道啦！”
Attended class, one face expects classmates the ground looks at a teacher, see she takes out article of a few appearance slowly from bag only, have beaker, have salt, small plastic cup, still wooden club writes a composition, the most important is to still have an unripe egg. The teacher says: "We do a little test today, good? " ground of all with one voice calls fellow students " good. " ground of all with one voice calls fellow students " good..
上课了，同学们一脸期待地看着老师，只见她从袋子里缓缓地拿出几样物品，有烧杯、有盐、小塑料杯、还有木棒，最重要的是还有一只生鸡蛋。老师说：“今天我们来做一个小实验，好不好？”同学们异口同声地喊道“好。”
Ground of small eye fix eyes on is staring at a teacher, at the beginning, the teacher poured the water of 400 milliliter in past measuring glass first, put the egg into water again then, I the heart thinks at that time " teacher, your dub is put, in case did the egg break how to do? " see the egg did not break finally, I just loosened at a heat. See the egg lies safe and soundly in cup bottom only, it is carefree and comfortable very.
大家的小眼睛目不转睛地盯着老师，一开始，老师先往量杯里倒了四百毫升的水，接着又将鸡蛋放入水中，我当时心想“老师，你轻点放，万一鸡蛋碎了怎么办？”最后看到鸡蛋没碎，我才松了一口气。只见鸡蛋安然无恙地躺在杯底，很是悠闲自在。
At this moment, the teacher is laughing to say: "I need a young aide, who wants to become? " " I come! I come! " everybody ground of strive to be the first raised little hand. Final teacher chose in the classmate of numerous raise one's hand small army become assistant. The teacher says: "Did not choose this those who go up is not disappointed, still have a lot of opportunities next time! " the teacher asked young aide to pour a few salt, ground of my fix eyes on is looked at, for fear that is missed any detail. Young aide keeps agitate, I feel he got sweat urgently to come out, but the egg is only slowly stood to rise, rise without complete float.
这时，老师笑着说：“我需要一位小助手，谁想上来当？”“我来！我来！”大家都争先恐后地举起了小手。最后老师在众多举手的同学中选择了小军做助手。老师说：“这次没选上的不要失望，下次还有很多机会哦！”老师请小助手倒了一些盐，我目不转睛地看着，生怕错过任何的细节。小助手不停地搅拌，我感觉他急得汗都出来了，可是鸡蛋只是缓缓立了起来，并没有完全浮起来。
The teacher lets young aide homing later, oneself pour salt in gently past beaker again, sufficient agitate. I am more nervous, must succeed, must succeed, I am reading aloud in the silent in the heart. Passed a little while, egg slowly float rose. Wow, succeeded! Succeeded really! Classmates cheer. Look at the egg that shows cerebella bag, we become very happy.
之后老师便让小助手归位，自己又轻轻地往烧杯里倒盐，充分搅拌。我更加紧张了，一定要成功，一定要成功，我在心里默念着。过了一会儿，鸡蛋慢慢浮起来了。哇，成功了！真的成功了！同学们都欢呼起来。看着露出小脑袋的鸡蛋，我们乐开了花。
Final teacher tells us, the egg can float on brine, can " swim " , it is the density of the egg of density prep above as a result of brine. We acquired knowledge already today, participated in so interesting experiment again, particularly happy.
最后老师告诉我们，鸡蛋之所以会漂浮在盐水上，能“游泳”，是由于盐水的密度高于鸡蛋的密度。今天我们既学到了知识，又参与了那么有趣的实验，特别开心。(文/王书涵)