old hand at
: very experienced at doing something
"이따끔, 때때로"
A.
Rob is an old hand at working with dogs.
He has been a dog trainer for 20 years.
He could write a book on what he knows about dogs!.
B.
Peggy is an old hand at organizing birthday parties. She had eight children.
If you need any advice on giving birthday parties, ask her.
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