If you don't know where you're going, and they don't know where they're going, we have a classic case of the blind leading the blind; both of you will end-up in a ditch.
如果你不知道你的人生方向在哪儿，他也不知道他的人生方向在哪儿，那么这就是问道于盲的经典案例，你们会一同陷入沟壑。
You know why you hid in that ditch?
你知道你为什么躺在那个壕沟里面吗？
But in the wake of the news about flossing, when it comes to oral hygiene, how much does your average person know about what we should be doing - and which habits do we need to ditch?
但是在有关牙线洁牙无用的报道出来后，人们开始关注口腔卫生问题，但究竟哪些是我们应该做的，又有哪些习惯是我们应该摒弃的？
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