They're looking for sources of sustainable shrimp. Kakutani says shoppers get frustrated when they can't find their favorite fish.

VOA: standard.2010.07.14

when you feel upset or when you feel frustrated that something is not going the way that you wish it would.

当你觉得很失落，或者当你因为事情不像你期望的那样进展而感到沮丧时，你也可以使用这个句型。

I'm frustrated 课堂 - SpeakingMax英语口语达人

Use the "I'm frustrated" pattern to express yourself when you feel stifled,

当你觉得很压抑的时候，你可以使用“I'm frustrated”句型。

I'm frustrated 课堂 - SpeakingMax英语口语达人

"When unemployment is 9.7 percent, when we are still digging ourselves out of an extraordinary recession, people are going to be frustrated, and they are going to be looking to the party in power to try to fix it.

VOA: standard.2010.02.06