have sth at one's fingertips
表示某物随时可取用，或对某事完全熟悉、了如指掌；也可说 have sth at your fingertips。
She has all the company's records at her fingertips.
她手边就有公司的全部记录。
指尖
fingertips — plural of fingertip
人类手指的尖端；手指的末端(指尖)；指套
the tip of a finger
人类手指的尖端
The tip of the human finger.
手指的末端(指尖)
the end (tip) of a finger
She touched the screen with her fingertip.
她用指尖触摸屏幕。
用法提示：fingertip 作名词，指手指的尖端部位。
He felt a sharp pain in his fingertip after the cut.
割伤后，他感到指尖一阵剧痛。
用法提示：fingertip 作名词，表示手指末端，前面可用形容词修饰。
They used their fingertips to feel the texture of the fabric.
他们用指尖感受织物的质地。
用法提示：fingertips 是 fingertip 的复数形式，指多个手指的尖端。
表示某物随时可取用，或对某事完全熟悉、了如指掌；也可说 have sth at your fingertips。
She has all the company's records at her fingertips.
她手边就有公司的全部记录。
置于名词或形容词之后，表示“完全地、彻底地”，通常带有褒义。
He is a professional to his fingertips.
他是个彻头彻尾的专业人士。
说明动作是借助指尖完成的，强调方式；常见于打字、触摸等场景。
She tapped the screen lightly with her fingertips.
她用指尖轻轻点了点屏幕。
表示用手指尖在某物表面轻轻移动，介词 over 或 along 均可。
He ran his fingertips along the edge of the table.
他用指尖沿着桌边划过。
grammar · medium
易错句子She counted on her fingertip: one, two, three.
正确表达She counted on her fingertips: one, two, three.
fingertip 是可数名词，前面有表示多个事物的语境(数数用的不止一个指尖)时必须用复数 fingertips。汉语名词不随数量变化，学习者容易漏掉 -s。改动只是把单数换成复数，句意不变。
grammar · medium
易错句子He put the ring on his fingertip.
正确表达He put the ring on his finger.
fingertip 只指手指最末端的那一小块，而戒指是戴在整根手指上的，所以此处该用 finger 而不是 fingertip。这是把“指尖”和“手指”混为一谈造成的选词错误；只替换这一个词即可。
grammar · medium
易错句子She has all the company's data in her fingertips.
正确表达She has all the company's data at her fingertips.
表示“资料随手可得、了如指掌”的固定短语是 at one's fingertips，介词固定用 at。汉语“在指尖上”容易让人直译成 in，但英语这个习语不用 in。只改介词，意思和语气都不变。
近在手边；唾手可得
With this app, the whole dictionary is at her fingertips.
有了这个应用，整部词典都近在她手边。
彻底地；浑身都是（强调某人完全具备某种特质）
He's a gentleman to his fingertips.
他是个彻头彻尾的绅士。
（警察手拉手进行的）指尖式地毯式搜查
Police carried out a fingertip search of the woods.
警方对那片树林进行了地毯式搜查。
指尖操控；轻触即可操作
The new camera gives you fingertip control over every setting.
这款新相机让你用指尖就能操控所有设置。
用手指尖轻抚某物
She ran her fingertips over the smooth surface of the stone.
她用手指尖轻轻抚过那块光滑的石头。
Choose the next layer that will help you use fingertips with more confidence.
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Dictionary facts from ECDICT, WIKTIONARY.
用指尖触摸某物
He felt the fabric with his fingertips to check its quality.
他用指尖摸了摸那块布料，检查它的质地。