tail of a coin 硬币的反面
What has a head and a tail but doesn't move by itself? A coin.
什么东西有头有尾但自己不会动？硬币。
On the contrary, just as a coin has both head and tail, these Internet-based means have their problems, too, if not properly used.
相反，万事都有两面，如果使用不当，这些工具也会对人们不利。
Your place or mine? Tell you what? I'll flip a coin. Head at my place, tail at yours.
去你家还是我家？要不这样吧，掷硬币决定，人头我家，字面你家。
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