单词at-one-s-fingertips
Computer technology puts all the information in the world at one"s fingertips.
这个曾经翻译过，电脑技术机把所有的信息通过指尖传递到世界。
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
Have something at one"s fingertips
对某物了如指掌