1. penetrated into 意为“渗透进”。
2. we can ... we can ... 排比句增强气势。
3. However, while ... 意为“然而，与此同时”，转折引出网络的弊端。
4. Due to the poor administration and weak security, 意为“由于...”
5. you should think twice before you type it in “三思而后行”
