'Let me explain!' he added helpfully.

“让我来说明一下！”他热心地补充道。

《牛津词典》

He gave his name and then helpfully spelled it.

他说出了他的名字，然后又热心地把它拼读了出来。

《柯林斯英汉双解大词典》

She helpfully suggested that I try the local library.

她很热心地建议我试试本地的图书馆。

《牛津词典》

Better to avoid the unstable hammocks altogether, since they're filled with snakes, occasional bears, and flesh-eating plants that, helpfully,feed on mosquitoes.

VOA: standard.2010.03.29

Organisers have helpfully put on shuttle busses to take press from downtown Malmo to the arena.

BBC: Eurovision Song Contest 2013: Reporter's log

The next sentence offered the names of contacts at DOT and helpfully included a phone number.

WSJ: Lost Cause in New York

As the site helpfully points out, telling a story is different from lodging a complaint.

FORBES: Consumerfinance.gov: This Is a Government Website?