"The immune system is like a double-edged sword; it can fight cancer but also needs to be controlled."

The forest doesn't belong to us; we belong to the forest.

The night is a great ocean, but the stars are its waves.

理论与其说是错误的，不如说是不完整的。

我们必须投资于研究和教育，以确保水产养殖与自然和谐发展。

人分这么几种：不认识，认识，熟人，朋友，知心朋友。朋友不在当面表白，而是背后说起朋友的时候，是否提到过你。