优先权仅意味着，第三方无权使用由其它两方所签订合同而上产得权利，即仅仅属于双方那个合同规定的权利，也无权据此抗辩。

The doctrine of priority merely means that the third party is not entitled to enforce the rights (or to rely upon defense) which arise, and arise only, under a contract between two other parties.

youdao

这样的设计方式有其风险，因为你可能得在优先权机制与磁碟使用效能上作取舍。

The danger is that there is probably a tradeoff between enforcing priority and scheduling the disk efficiently.

youdao