信手拈来（信手拈來）　

◎ 信手拈来 xìnshǒu-niānlái

[toss;pick up at random;have words,materials etc.at one‘s fingertips and write with facility] 随手取来。形容写文章等时词汇或材料丰富,能熟练运用

信手拈来尽可惊。——宋· 陆游《秋风亭拜寇莱公遗像》