New words：

primary ['praiməri] adj.主要的；最重要的；基本的；最初的；初级的

Sample Sentences：

The little boy left primary school at eleven.
Food and water are primary wants of human life.
A primary cause of Tom's failure is his laziness.
He only accepted the primary education off and on in his childhood.

failure ['feiljə] n.失败；故障；失灵；倒闭

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