But if we accept the no branching rule, we're saying whether or not we've got identity depends on what's happening elsewhere.
但如果我们接受了无分支规则,就等于赞同,我们是否有认同感依赖于在别处发生的事情。
In contrast today, because we have antibiotics and we have vaccines, people don't die of infectious diseases as often.
相反,在现在,因为我们有了抗生素和疫苗,死于感染性疾病的人就不像以前那么多
When a body is going around a circle, they say that's some centrifugal force acting.
如果一个物体做圆周运动,他们就说有离心力作用于这个物体
to be killed in a plane accident this weekend and there was a guest lecturer for you on Tuesday there'll be somebody alive lecturing to you.
我周末死于空难,而下星期二又有客座教授的话,就会有人活着给你们上课。
As I said, in some context last time, how many Russian peasants died in the 1890s thinking, "Oh my god, if the Czar only knew that we're starving, how angry he would be with his officials."
就像我在上一讲提到的,有多少死于1890年代的俄国农民会想,"上帝啊,要是沙皇知道我们在挨饿就好了,他该对手下的官员发多大的火啊"
So economically it meant more-- it made more sense to eat meat under those circumstances, but of course the meat didn't exist in all places of the world, so some people were dependent on plants.
因此,从经济角度看,在那样的环境中,食肉更加合理,当然肉类并不是世界各地到处都有,因此,有些人们就依赖于农作物
We know there is no thing called a massless rope, but most ropes have a mass, but maybe negligible compared to the two blocks you are pulling, so we'll take the idealized limit where the mass of the rope is 0.
我们都知道无质量的绳子是不存在的,是绳子就有质量,但是相比于这两个物体就可以忽略不计了,所以我们有了这个理想的条件,即绳子的质量都是 0
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