need not;not have to;not necessary ;

He doesn't have to go through this elaborate display for my benefit!
他不必为了我作这么详细的展示!
来源:《柯林斯高阶英汉双解学习词典》Do not be surprised if, initially, she directs her anger at you.
如果一上来她就冲你发火,不必惊讶。
来源:《柯林斯高阶英汉双解学习词典》There could be more unrest, but I wouldn't exaggerate the problems.
可能会有更大的动荡,不过我想也不必夸大问题。
来源:《柯林斯高阶英汉双解学习词典》It enabled its members to settle their differences without recourse to war.
这样,其成员就可以不必诉诸战争来解决分歧。
来源:《柯林斯高阶英汉双解学习词典》
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