"白搭(báidā)" is a colloquial word. It means certain ways or ideas are of no use or inefficient. It also indicates that it is a waste of time and energy to do something without achieving the expected results.
例句 Sentences
1、 学习汉语,方法很重要,但是如果不努力也是白搭。 Xuéxí hànyǔ, fāngfǎ hěn zhòngyào, dànshì rúguǒ bù nǔlì yěshì báidā. A good method for learning Chinese is important, but it would be useless if you do not put efforts into it.
2、 为了这个考试,我这一周每天都熬夜看书,结果还是不及格,唉,一周的时间全都白搭了。 Wèile zhège kǎoshì, wǒ zhè yìzhōu měitiān dōu áoyè kàn shū, jiéguǒ háishì bù jígé, ai, yìzhōu de shíjiān quán dōu báidā le. I stayed up late all week for this exam, but still failed. It seems that all my efforts are spent in vain.