Dot the i's and cross the t's  在i上点点，在t上画横

Dot the i's and cross the t's means to be careful, thorough, and to pay close attention to details. “在i上点点，在t上画横”的意思是要小心，全面，仔细关注细节。


"Charles ! You forgot to proofread your essay and it is full of spelling mistakes ! You must be careful to dot the i's and cross the t's when you do your work." “查尔斯！你忘了校对你的文章，拼写错误百出！你做作业的时候必须要认真仔细。”