洞是无形的，就如人不会是十全十美，我们或许永远填不满这洞，就好像人不会十全十美，也就正如学习，学习是无止境的。
The hole is intangible, as people are not perfect, we may never fill the hole, as if people do not perfect, also like learning, learning is endless.
我们不张扬，我们知道知识是无止境，我们努力学习更多。
We do not play, we know that knowledge is endless, we strive to learn more.
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