用整个手掌而不是用一个手指指示方向。

Show direction with your whole palm instead of one finger.

youdao

在为客人指引方向的时候，应遵循五步规定即陪同客人向目的地方向至少步行五步，同时伸出手臂指引方向。 绝不使用手指指示方向。

Colleague to follow '5 step rule' with the guest offering direction with a open arm gesture walking towards the destination the guest is looking for, no pointing finger at any time.

youdao

Advance this pointer-- this finger, to the next element of the list which is 4, make the comparison.

前移这个指示器--也就是这根手指，让它指向列表中的,下一个元素4，再做比较。

哈佛公开课 - 计算机科学课程节选