a high level of knowledge or skill专门技能(知识);专长
More examples
I've been in this job for 30 years, and I've picked up a good deal of expertise along the way.
Software is not really my area of expertise.
You place too much reliance on her ideas and expertise.
He is known for his expertise in the history of British economics.
The database is simple to use and requires no expertise at all.
👨🏻🏫 Mr. Ng 劍橋詞典 📚 – cambridge.mister5️⃣.net
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