外加的

Online security is being built in to the system, not tagged on.

机安全措施正被內置在系统中,不是外加的。

With these extras your PC will become the all singing, all dancing box the salesman claimed it would be.

有了这些外加设备，你的电脑就成了推销员口中的术先进，功能齐全的盒子了。