这些画是很复杂的,要画好得花很多功夫。
Once the stuttering habit is ingrained, it will take a lot of work to eliminate it.一旦弹琴结巴的习惯养成,要摆脱它则是一项巨大工程。
It can take a lot of work and a significant amount of knowledge to make a useful electronic gadget.制作一个电子物件需要做很多工作和大量的知识。