We have an object which has a mass, m1.
有一质量为m1的物体。
Since you also know the periods, you can find what m1 plus m2 is.
既然知道周期的值，就能知道m1 +m2的值。
Then create a blank model, and name it M1.
然后创建一个空白模型，并命名为 M1。
This is put together with the original model M1.
将它同原始模型M1组装到一起。
M1:Look, there is a policeman, let's ask him the way.
看，那有一个警察，我们去问他吧。
M1: You learn the secretarial profession, what can show it?
面试官甲：你学的是文秘专业，有什么可以展示的吗？
Again, these purchases increase the money stock from M0 to M1.
同样，央行的债券购买将会使货币存量从M0增加到M1。
Again, these purchases increase the money stock from M0 to M1.
同样，央行的债券购买将会使货币存量从M0增加到M1。
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