“用完”的英语可以翻译为：finish，run out，use up，[经] exhaust，go through ...

每次用完洗发剂后都要用清水将头发冲洗几次。After shampooing, always rinse the hair several times in clear water.到这时,他的存款已全部用完.By this time he had used up all his savings.他已用完最后一滴油.He has used up the last ounce of oil....