Physically, see, this guy on the left is the total amount of stuff that goes out of the region per unit time.

看这儿，左边的这个是单位时间内,从区域里出来的流量。

youdao

As you continue your presentation, you say something that seems to bother the person sitting mid-table, a few seats down to the left of the boss. This guy is in clear view of the boss at all times.

你继续着，你说的一些东西似乎触犯了坐在桌子中部与老板相隔几个座位的一个人，他总在老板的视野之内，这个人虽有反应但却没说什么，你也不在意他的反应，因为你已经着迷于老板对你的赞同，你是不能把视线从她身上移走的。

youdao

On this guy, I have 10 from the left 10 acting this way, 4 acting that way.

对这个物体,受到一个 10 牛的从左向右的力,10牛的力朝这边,4牛的力朝那边

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But the difficulty is, if you take your left flank and move it out here so you can flank this guy, one of two things has to happen to your army.

但困难的是,如果你把左翼移到这里,你可以进攻敌人的侧翼,你的军队会面对下面两种情况

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