He will keep on fighting until he wins light.

他得不到光明便不会停止战斗。

They keep on fighting in spite of all the setbacks.

他们百折不回地战斗下去.

You must keep on fighting until the final victory belongs to you.

你必须继续作战直到最后胜利属于你为止。

They said that they would keep on fighting in spite of all setbacks.

他们说他们将百折不回地战斗下去。

You must keep on fighting until (till) the final victory belongs to you.

你必须一直奋斗，直到最终的胜利属于你为止。

That's what middle-class economics is all about, and as long as I'm your President, that's what I'll keep on fighting to do.

这才是有利于中产阶级的经济政策需要做的，只要我还是总统，我就将为此而不懈奋斗。