However,there still exist some problems in the network security because of some technical and artificial factors,the network is often attacked by hacker,we usually feel worried about while dealing with some businesses.

• 但是 ；由于技术和人为的因素 ；网络遭遇攻击的事件时有发生 ；这使得我们在利用网络进行交易时总是有所顾虑 .