electronic pet电子宠物electronicadj.电子的；电子学的electronic-controlled diesel engine电控柴油机electronically tunable optical filter电子可调谐光学滤波器Electronic Performance Support Systemn.电子绩效支持系统electronic time sequence control unit电子时序控制装置electronic reverse current controller电子反向电流控制器electronic-type current transformer电子式电流互感器Electronic Warfare Operational System电子战作战系统electronic electrocardiogram analyzer电子心电分析仪electronic craft practically teaching电子工艺实训electronic and information profession电子信息类专业

1. A non-delivery receipt that is sent to an e-mail sender when a message cannot be delivered to the intended recipient temporarily or permanently.
   暂时或永久性地无法将邮件传递到目标收件人时发送给电子邮件发件人的未送达回执。
2. For a service by mail, the date of acceptance marked on the receipt of the mail is the date of service.
   邮寄送达的，以回执上注明的收件日期为送达日期。