Even so, he thinks novel approaches such as mobile-based validation may "harden the target", just as a burglar alarm makes your home somewhat trickier to rob.

即便如此，他也认为，像基于手机的验证技术等新方法可以“使目标更坚固”，就像防盗报警器多少会使你家变得难偷一点。

youdao

When you go through a metal detector at the airport with a conductor such as keys in your pocket, the alarm goes off.

当你带着一个导体（比如口袋的钥匙）走过机场的金属探测器时，机器会发出警报声。

youdao

There are different kinds of activities there, such as a bathing day, an alarm, birthdays… Anyway, everybody’s busy.

船上有各种活动，比如洗澡日、警报行动、生日庆祝……但话说回来，每个人其实都是很忙的。

youdao

From practical necessities such as an alarm clock or a new set of linens to fashionable indulgences such as high-end headphones, we firmly believe there is no reason for anyone--much less a college student--to fork over the big bucks to live the good life in the dorm.

FORBES: Affordable Luxuries: Dorm Rooms