New Words：

frustrate [frʌs'treit]
v.挫败；使懊丧；使懊恼；使沮丧
adj.无效的；受挫折的；被破坏的；失败了的

Sample Sentences：

The terrible weather frustrated our hopes of going out.
A poor memory frustrated her efforts to become an actress.
We taught and learned together and encouraged each other when we were frustrated.

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