"They exchange gifts" 是互相送礼物的英语表达方式。
Exchange 这个词的意思是"交换"，而 gift 则是"礼物"。因此，exchange gifts 就是"互相送礼物"的意思。
下面是一些使用 exchange gifts 的例句及其中文翻译：
"For Christmas, my family and I always exchange gifts on Christmas Eve." (我和我的家人每年圣诞节前夕总是互相送礼物)
"The couple exchanged gifts on their anniversary." (这对夫妇在他们纪念日上互相送礼物)
"The students in the class decided to exchange gifts during their Secret Santa event." (班里的学生们决定在他们的神秘圣诞老人活动中互相送礼物)