detective work

noun
🔊/dɪˈtektɪv wɜːk/
🔊/dɪˈtektɪv wɜːrk/
[uncountable]
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  1. the activity of trying to discover more information about something
    • He did some detective work and figured out what had happened to his bike.他做了一些侦探工作,并弄清楚了他的自行车出了什么事。