Well, that's why the letter won't be from me.

所以我不会寄出这些信件

Then there can be no room for error.

那样舆论就无的放矢了

for who I really am.

真实的我

My name is Linda Marchiano.

我的真实名字是琳达·玛奇阿诺

and with that total mass M12, which is just m1 + m2,

总质量为 M12 也就是 m1 + m2

and put that here, and forget these two.

把它放在这里 忘记这两个物体

Actually, in doing so, the first circle of mourning,

实际上 第一圈子

family, a substitute for the relatives who were not present when the soldier was killed.

代替了死者死前不在场的家人

where it imagines all the mass concentrated at the center of mass.

可以假设所有的质量都集中在这个点上

It has a mass equal to total mass.

它的质量是体系的总质量

Okay, but you see what you've done is,

但是你发现你所做的只是一小部分

What you're really doing in the market is trading the treasuries.

你真正做的是在市场中交易债券