Progress was frustratingly slow.

进展慢得使人沮丧。

《牛津词典》

But the process is frustratingly slow.

但这过程慢得让人郁闷。

youdao

Unlike many of his colleagues, Porter is frustratingly unquotable.

与他的大多数同事不同，波特极其讨厌别人引用他的文章。

youdao

Then he had a machine that granted each pigeon one piece of corn every fifteen seconds; that's very, frustratingly slow for a hungry pigeon to get one piece every fifteen seconds.

他们设计了一个能保证,每隔15秒给鸽子喂一玉米粒的装置,对饥饿的鸽子来说是杯水车薪,每15秒才只有一粒玉米

耶鲁公开课 - 金融市场课程节选

It's true and sensible, as far as it goes, but also obvious and frustratingly subjective.

FORBES

Some things that have been frustratingly difficult in the past are now much easier.

FORBES: The Technology Of SAP's Open Strategy

Despite its frustratingly cumbersome birth, the incoming government plainly has a fund of popular goodwill.

ECONOMIST: Iraq