unrewarding meaning in English

不合算的
不能赢利的
无利可图的

Lectures often seem very formal and empty things ; recitations generally prove very dull and unrewarding
讲座给人的感觉常常是非常正式且言之无物；背诵总是非常的枯燥且徒劳无益。
Fear of a capital loss , and dissatisfaction with unrewarding yields , have triggered a flurry of ideas on how to put the money to better use
由于担心资本受损和收益下降，使得中国央行急需考虑如何更好进行资本投资。
But women predominate in the lower - paying ， menial ， unrewarding ， dead - end jobs ， and when they do reach better positions ， they are invariably paid less than a man for the same job
妇女主要从事工资低、伺候人、没有前途的工作。即使她们获得较好的职位，他们的工资也总是比同样工作的男人低。
One day in the autumn of 1930 , i was gazing at the notice board in the post office of the main men ' s residence at the ontario agricultural college , where i was then a senior . it was usually an unrewarding vision but on this day it advertised a number of research assistantship at the giannini foundation of agricultural economics at the university of california
试着翻译了一下：在我们农场1月1日并不是新年的开始，那天只是一个纯粹形式上的意义，仍然是可恶深冬的一部分，但是到了三月，随着时间的推移，所有的农场都开始忙起来了，那就是打槭树叶。