对于点P，若光程差为： θ λ sin ) 2 1 ( 1 2 a m p s p s ≈ + = ∆ = − 破坏性干涉 ( destructive interference ) 即到达P 点的光相位差 ，在屏幕上为暗纹。
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“安元鼎事件是如此邪恶和极具破坏性，似乎公共安全局仅留下了一丁点选择权，那就是干涉和调查。”许如是说。
"The Anyuanding affair is so sinister and damaging, it appears that the public security authorities were left with little choice but to intervene and investigate," Mr. Xu said.
（其）扭转（干涉）竞争的国家救助（产生）的破坏性影响和确保被救助公司有可行性商业计划的两个目标没有争议。
The objectives of reversing the damaging effects of state aid on competition and of ensuring that bailed-out firms have viable business plans are not controversial.
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