1·You nod and people know you are saying "Yes".
你点头，人们就会知道你在说“是”。
2·I know people can replace these words with a smile or nod.
我知道人们可以用一个微笑或点头来代替这些话。
3·In contrast, they might only respond to a girl's comments with a nod.
相比之下，他们可能只会用点头来回应女孩的意见。
4·Of course, in certain circumstances, a simple wave, nod or smile may be appropriate.
当然，在某些情况下，简单的挥手、点头或微笑可能都是合适的。
5·A friendly nod or a wave of acknowledgement in response to an act of courtesy helps to create an atmosphere of goodwill and tolerance so necessary in modern traffic conditions.
对礼貌行为的友好点头或挥手感谢有助于创造带有善意的宽容氛围，这在现代交通条件下是非常必要的。