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nullify
vt.
他無權廢除法律。
物價的上漲抵銷了薪資的增加。
以上來源於:《英漢大辭典》
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閱讀Part1
Their ability to undercut our pricing has basically ------- our advantage in quality and leveled the playing field.
(A) revamped
(B) nullified
(C) entrenched
(D) preempted