求翻译：4.2.4 Vesting. no Contracts of any Group Company relating to its Equity Securities provides for acceleration of vesting (or lapse of a repurchase right) or other changes in the vesting provisions or other terms of such agreement or understanding upon the occurrence of any event or combination of events. No Group Company has ever adjusted or amended the exercise price of any share options previously awarded, whether through amendment, cancellation, replacement grant, repricing, or any other means.是什么意思？

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