He is paid to grumble all day long.

他是被雇来整天嘟囔的。

youdao

Opposition members seized on the opportunity to grumble about mounting public debt.

反对派议员抓住这个机会，猛烈抨击不断增长的国家债务。

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At least, that's what people like to grumble; sometimes, though, the impression is actually accurate.

至少，人们常常是这样抱怨的。有时，人们这种感觉其实是正确的。

youdao

When Apple co-founder Steve Jobs rejoined the company, in 1997, Apple users were the ones with reason to grumble.

FORBES: Leopard On The Prowl

Internally, a few people have been heard to grumble that the company might just be a bit too big.

FORBES: Magazine Article

The overall outcome suggests the north-east of England has plenty reason to grumble about the share of the pie it's getting.

BBC: Scottish independence: Braveheart or iPad?