There's a little icon of a hand here, at top left, you go ahead and click that, and what happens is, we, the staff, see a little blinking icon in the top left that says one out of two hands, one out of 10 hands, or some number of hands, and it maintains in the little row up there your placement in line.

这里有一个小的手势图标，在左上角,点击它，我们教员，在左上角就看到一个小的闪烁的图标，这说明,两个人中有一个举手，10个人中有一个举手，或很多人中有人举手，并且它处于一行之中,那里你们布置成一行了。

哈佛公开课 - 计算机科学课程节选