be an old hand at=be very skilled and experienced
He is an old hand at that work/this. 彼はあの仕事/これについてはベテランである.
She is an old hand at training dogs.
Do you have any pets?
Yeah, I have/keep beetles and earthworms in plastic cages.
He's also an old hand at breeding Japanese rice fish.
It needs to control air ventilation.
beetle
a plastic cage
air vent
Japanese rice fish
Japanese Killifish
air vent
ventilation 建物内の換気
air circulation 空気の循環
get fresh air 外からの新鮮な空気
Let(get) air out the room/Let(get) fresh air in 空気を入れ替えよう
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