So if you archive it, that's maybe a little hint that either this is just your habit or perhaps that you might actually care about this later in the future, whereas if you delete it, no, you really don't care. Yeah.
如果你把邮件存档,可能暗示这可能,是你的习惯,或者以后还会用到它,相反,如果你删除了它,说明你可能根本不在意这个邮件。
But again, that's the healthy diet. That's not the junk food diet.
但是话说回来,这是健康的饮食习惯,而不是垃圾的饮食习惯。
Now just to get used to the conventions, 0 because this is the program you'll use not for problems at 0 but for 1 to start writing programs, notice at the top in this window just reminds you what you're working on.
我们要入乡随俗,习惯这样的界面,因为这是你们将要用到的程序,不是为习题集0,而是0,而是为习题集1开始写程序的,注意窗口顶部,这是用来提醒你,你工作在何种环境。
And it's actually critically important to get used to things because it's a useful adaptive mechanism to keep track on new events and objects.
而习惯化实际上也是至关重要的,因为这是一种非常有用的适应机制,可以让你注意到新鲜事物。
So if delta v is negative, in this case delta v is negative, OK, delta v is negative, pressure is a positive number, negative times negative is positive, work is greater than zero.
也就是当活塞,压缩气体的时候,做的功是正的,按照这一规定,我们需要在这里,加上一个负号,这是习惯规定。
Infinity is the force when we're thinking about it and our brains, negative infinity is when we actually plug it into the equation here, and the reason is the convention that the negative sign is just telling us the direction that the force is coming together instead of pushing apart.
说力有多大时,我们想到的,是无穷大,而方程解出来的,是负无穷,这是因为习惯上,我们用负号表示力的方向,是相互吸引而不是相互排斥的,所以我们可以用库仑定律。
It's a good thing.
这是一个很好的习惯。
As a matter of convention and good style which is another theme of the course that we'll focus more - on on Friday onward, it's generally good to-- good style to actually describe in English even succinct English, what your program is doing.
大家要养成一个良好的编程习惯,这是本课程另一个重要的中心思想,我会在本周五还有以后的课堂时间着重强调这个问题-,用简明扼要的语言,描述你的程序,是一种很好的编程风格。
So I'll now start to get into that habit, even though it's a bit of distracting detail, it's just consistent with the expectations that the compiler really has.
所以我现在将开始养成那个习惯,虽然这是一个有点分散注意力的细节,它只是与编译器,拥有的期望是并存的。
Unfortunately, that's the evolution of nagging.
不幸的是,这就养成了他磨人的习惯。
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