T he power is inside you to think young and therefore restore your youth all over again .
你内心呼喊年轻的力量会让你再次焕发青春。
The power of linearity is F=k1+k2 if I come across f of x, y, z equals k1 plus k2, if it is a linear equation, I don't have to go and solve it all over again.
线性的威力是,一个方程,如果它是个线性方程,那么我就不用再去解他了。
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