如果你不告诉他们，谁也不会察觉。
如果你和某人经常通话联系并且察觉出了问题，你也许就不会再借钱给他了。
If you're on the phone with this guy all the time and you sniff something out, you can maybe stop lending him money.
或许这种假设在以前成立，但是数码拍照和光学技术在不断进步，从远处就可以轻而易举地复制你的钥匙，你甚至都不会察觉。
Perhaps this was once a reasonable assumption, but advances in digital imaging and optics have made it easy to duplicate someone's keys from a distance without them even noticing.
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