By the way, when I say there's 10 Newtons acting this way, you might say, "What about gravity? What about the table?"
顺便提一下我说有 10 牛的作用力,你也许会问,"那重力呢,桌子对它的力呢"
And you have bread and cheese and tomatoes, and some oregano in the house.
你有面包、芝士和西红柿,屋子里还有一些牛至叶。
Here is some object, it's 5 kilograms and I apply 10 Newtons.
这有一个物体,5 千克,我对它施加 10 牛的力
You've got horses which you need for the army but also which they start slaughtering; you've got cattle but you have enough food to last for maybe a month; there's always a lot to drink because of the caves, that is, the wine cellars that people had, but things get worse and worse.
你有军队所需的马,但是士兵会把马杀来吃,你有牛,但是这些食物只能,维持大概一个月的时间,喝的东西总是不缺的,因为他们有酒窖,就是用来储藏葡萄酒的酒窖,不过事态还是变得越来越糟
Once you got a = 2, you can go back and realize here that f = 4, so you got really 4 Newtons.
一旦你算出 a = 2,你可以回到上面来,求出 f = 4,所以实际上这个力有 4 牛
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