To know it's no use , but keep on doing it -- there can be no greater folly than this.

知其不可而为之,愚不可及也.

《现代汉英综合大词典》

If they keep on doing evils, they'll reap what they sow.

如果他们继续作恶, 必将自食其果.

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Just keep on doing it.

坚持干下去.你也能做得很好.

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We must keep on doing so.

我们今后还要这样做.

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As long as we keep on doing so, we shall not alienate ourselves from the masses.

只要我们这样干了, 就不会脱离群众.

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I think it would be a good idea to keep on doing morning exercise.

我恐怕在发胖呢.我认为坚持早锻炼是个好主意.

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Once the machines have been put in working order, they will keep on doing the work.

一旦机器进入工作状态, 它们就会持续工作下去.

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