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Confucius said: no, not a gentleman, learning is not fixed.

不学则无术。

Learn not, and know not.

思而不学则殆。

thought without learning is perilous.

学而不思则惘, 思而不学则殆。

Learning without thought is labor lost , thought without learning is perilous.

学而不思则罔, 思而不学则怠。

To learn without thinking is labor in vain, to think without learning is desolation.

孔子告诉我们学而不思则罔，思而不学则殆。

Confucius tells us learning without thought is bourbons thought without learning is perilous.

目的好之时叫做忍耐，目的不好则叫做固执。

It is know by the name of perseverance in a good cause,and obstinacy in a bad one.

学而不思则罔

Learning without thought is labor lost

不用说, 学而不思则罔。

Needless to say, learning without thinking is useless.

学如逆水行舟，不进则退。

Study is like sailing against the current; either you keep forging ahead or you keep falling behind.

物理学的其他方向则描述哪些可以发生 哪些不可以

The rest of physics is about describing what can happen and what can't.