劳神费力 meaning in English

tax one's mind and strength; weary mind and use strength

Achieves the same effect in a different and laborious way
用另外一种劳神费力的方法达到同样的效果
If a plant extract helped to fight an infection , why bother trying to figure out which molecule did the trick
如果草药熬出的汤汁能够治疗某种疾病，为什么还要劳神费力地写出这一药剂的分子式呢？
The mystery is why , popular as he is , mr putin bothers with all these superfluous instruments of control
令人不解之处正在于此：普京热在俄罗斯如此风行，他为什么还要在那些多余的控制手段上劳神费力呢？
If i have a book which provides meaning for me , a pastor who has conscience for me , a doctor who will judge my diet for me and so on , then i do not need to exert myself
假如有书本为我释疑解惑，有牧师为我提供良知，有医生为我鉴别食谱，如此等等，那么我自己便不必劳神费力。