你不能仅仅因为情况不理想就放弃某人。
You can't just give up on someone because the situation's not ideal.
An expert is a person who has made all the mistakes that can be made in a very narrow field.
工作必须先于回报。
The only man who behaves sensibly is my tailor; he takes my measure anew every time he sees me, while all the rest go on with their old measurements.
代数几何是研究多项式零点的学科。