本文的主旨大意是从失败中吸取教训，永不言弃定能成功。
The main idea of the passage is learn from failure, never give up and you will succeed.
失败的原因之一是他的粗心大意。
他的失败是由于粗心大意。
粗心大意是他失败的原因。
研究表明，有效的使用交际策略对于第二语言学习者弥补有限语言资源和避免交际失败具有重大意义。
It is suggested that effective use of communicative strategies is of great importance for second language learners to compensate their limited language resources and avoid breakdowns in communication.
研究表明，有效的使用交际策略对于第二语言学习者弥补有限语言资源和避免交际失败具有重大意义。
It is suggested that effective use of communicative strategies is of great importance for second language learners to compensate their limited language resources and avoid breakdowns in communication.
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