packet addressing meaning in English

封包定址

Which statements describe layer 2 and layer 3 packet address changes as the packet traverses from router to router
当储存器从路由器到路由器横越，哪些陈述描述层2而且分层堆积3储存器住址变化
Bags addressed to an agent must not contain any packet addressed to any person or firm other than the agent . the usual limit of weight 2 kg for individual packets may be dispensed with , provided the total weight of the bag does not exceed 30 kg
寄给代寄商的邮袋，不得装载寄给其他人士或商行的邮件。个别邮件的重量毋须依照一般规定限于2千克或以下，只要邮袋的总重量不超过30千克便可。