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。

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A burglar alarm is an excellent device that makes your home more secure and lets you feel safe.

家中装一个防盗报警器能让家里更安全，也能让你更有安全感。

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Mr. Green has installed a burglar-alarm system in his home.

格林先生家装了防盗报警系统。

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