Question

Not all efforts will be paid back.Although people work hard

Answer 1

Not all efforts will be paid off(取得回报,侧重回报; 不用paid back "侧重还钱,偿还,报复").Although people work hard and get a reward,the reward maynot become the direct ratio with the efforts they paid.

maynot 前最好加上the reward 使句子更完整.