vis major

1. The overall exchange value of the Hong Kong dollar, as measured by the trade-weighted Effective Exchange Rate Index ( EERI), was predominantly affected by the exchange rate of the US dollar vis-à-vis other major currencies.
   以贸易加权港汇指数计算的港元整体汇价主要受美元兑其他货币的汇率影响。
2. It follows that if a regional currency arrangement will be established in East Asia, regional currencies should have stable linkages with each other and should be stable vis-à-vis not a single major currency but a currency basket.
   如果东亚建立了以货币篮、而不是以某种重要货币为中心的区域货币制度安排，那么区域内各货币间将会有稳定的联系，其币值本身也将更为稳定。

noun

1. a natural and unavoidable catastrophe that interrupts the expected course of events
   1. he discovered that his house was not insured against acts of God

   Synonym:    act of Godforce majeureinevitable accidentunavoidable casualty