B2 not using a lot of fuel, money, etc.经济的;省钱的;节约的
More examples
A big car like that is not very economical on fuel, is it?
You should buy ordinary everyday foodstuffs in bulk - it's more economical.
I had to buy a new washing machine as it would not have been economical to get it repaired.
She's very economical with the wrapping paper, isn't she? She cut it without an inch to spare.
This central heating system is extremely economical to run.
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