People usually exchange presents.
人们通常互换礼物。
我们要交换礼物。
Before graduation, students exchange presents with each other.
毕业前，同学们互相交换礼物。
We're going to go to middle school, let's exchange presents with our friends.
毕业之际，让我们和朋友们交换礼物吧。
People prefer to exchange presents and send Christmas CARDS to their friends.
人们喜欢互换礼物，给朋友寄去圣诞卡。
People usually exchange presents, and eat Turkey and Christmas pudding on this day.
在这一天人们通常交换礼物，吃圣诞火鸡和圣诞布丁。
A: Great! Now please exchange your presents in groups.
非常好，下面请同学们在组内交换礼物。
Do you exchange the presents in the morning?
你们在早上交换礼物吗？
This paper presents introduction of the target zone exchange rate system.
本文介绍汇率目标区的基本模型。
This paper presents an identity-based authenticated key exchange protocol in the standard model.
提出了一个标准模型下的基于身份认证的密钥协商协议。
This paper presents an identity-based authenticated key exchange protocol in the standard model.
提出了一个标准模型下的基于身份认证的密钥协商协议。
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