I had it at my fingertips.



我对一切了如指掌，at one's fingertips指"了如指掌"。



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手指是 Finger，手指尖是 Fingertip，at one' s fingertips 是英语一句常用的词组，一般而言，动词 Has / Have 也会放在词组的前面，全句解为：精通某事，或对某事了如指掌。这成语有"一切尽在你掌握之中"的意思。

再参考以下例子：

You'd better ask Professor William about the population issues. He has the whole subject at his fingertips.

关于人口的问题，可请教廉教授，因他对于整个课题也十分熟悉。

与此相关的成语有： Good / clever at 是善于、精于或擅的意思。如：

I wish I were clever at languages because I want to be an English language teacher.

我真的希望能精通语言，因我很想成为英语教师呢！



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