calling to mind one's past sufferings and thinking over the source of the present happiness;recalling one's sufferings in the old society and contrasting them with the happiness in the new
忆苦思甜
recall bitterness in the old society and contrast it with happiness in the new China;recall past sorrows and savour present joys
忆苦思甜yì kǔ sī tián
回忆过去所吃的苦，想新社会的幸福生活给人民所带来的甜美。contrast past misery with present happiness, recall the sorrows of the past and savour the joys of the present