Question

many years ago when people had no

Many years ago when people had no thermometers ,they usually touched a thing to see how hot or cold it was.The following experiment shows how easy it was to make a mistake.
Take three glasses;the first one with very hot water,the second one with very cold water,and the third one with water at room temperature.Then you put a finger of one hand in the hot water,and a finger of the other hand in the cold water.You hold your fingers in the two glasses for a minute.Then you use rach finger,one after another,to see how hot or cold the water in the third glass is.You will find that the water is warm to the finger that was in the cold water before,but the finger which was in the hot water will feel cold in the same glass of water.
That is why you must always find the temperature in a scientific way.You must not try to tell the temperature as it seems to you.
You will ofen make a mistake if you take someting that seems to you for a real fact. For example when you are going to an anusement park by bus and you want to get there very quickly,it seems to you that your bus is going very slowly.It`s slower than the other buses .But if it is Sunday and you have much free time,it seems to you all the buses and cars are going very fast.
翻译的好的给加分，谢谢，明天就用了，今天就采纳

Answer 1

很久以前，人们还没有温度计的时候，他们常常去摸一件东西来辨别它是冷是热。下面的实验展示了这种方法是多么容易出错。
拿三个杯子：第一个装热水，第二个装冷水，第三个装室温下的水。然后你一个手指放到热水里，再把另一只手的手指放到冷水里，保持一分钟。然后分别用这两个手指去感觉第三个杯子里的水是什么温度。你会发现感觉到温暖的那个手指是之前放在冷水里的，而在同一个杯子里的原来放在热水里的手指则感觉到冷。
这说明你必须用科学的手段来测量温度，而不要试着凭感觉来辨别温度。
谢谢参考！