释义：不是（等于was not），介词
短语：
1，wasn't absolutely 并非绝对
2，wasn't told 被动语态
3，wasn't brought 没有被带到
4，Wasn't wanted 根本毫无必要
造句：
1，He wasn't discouraged when they threw cold water on his ideas.
他们对他的想法泼冷水时， 他并不泄气。
2，At first I wasn't aware that he was ill.
开始我没有察觉到他有病
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