Backflip支持 AT&T公司的3G网络，在享受了100美元的邮寄退款折扣之后费用为100美元，合同期两年。

The Backflip, which runs on AT&T's 3G network, costs $100 after a $100 mail-in rebate and a two-year agreement.

youdao

为履行本合同而需要发出的任何通知、文件或资料，双方可以互相直接送达，也可以通过邮寄送达。

Any notice, documents or materials, which for the purpose of performance of this contract, may be delivered by hand between parties hereto, and also by mail.

youdao

本合同项下要求的任何通知，按照下列地址以特快专递邮寄，即视为履行通知义务。

Any notices hereunder shall be sent to the following addresses by express mail service (EMS) and shall be deemed to have performed the obligation of notice.

youdao