人类的尾巴已经消失了，这是数百万年进化的结果。未来，人类会变得更高、更强、更聪明吗？
The tail of humans has gone. It's the result of evolution for millions of years. Will humans be much taller, stronger or smarter in the future?
除非他能隐藏自己的尾巴，否则他不能成为人类。
人在脊椎末端有一块骨头，这有助于证明人类(可能)曾经有过尾巴。
A human has a bone just after the spine ends, which helps proves that humans once had tails (possibly).
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