许多精力 lots of energy ; A lot of energy ; Many energy

不要花太多精力 Don't spend too much energy ; Don't spend too much effort

有许多的精力 There's a lot of energy ; There are many energy

有很多精力 A lot of effort

我应该集中更多精力 I should focus more

花费很多精力 burn the candle at both ends

人还有更多精疲力竭 Many More Experienced Exhaustion

集中更多的精力于 Focus more energy on ; concentrate more energy on

消耗过多的精力 burn a candle at both ends