Add Role Models.

模范作用。

youdao

To create a new role, type its name in the blank field, then click Add role.

要创建新的角色，在空白字段中输入它的名称，然后单击add role。

youdao

Repeatedly select the Add role icon to create four roles as shown in Figure 5.

反复选择add Role图标，创建4个角色，如图5所示。

youdao

I expect that if I add -A to A, I should get the guy who plays the role of 0 in this world, which is the vector of no length.

我希望如果用 -A 加上 A,应该得到一个零矢量,也就是一个没有模长的矢量

耶鲁公开课 - 基础物理课程节选

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