No jurisdiction so far has tried using age verification methods like biometrics or government identification to enforce a social media age cut-off, two of the methods being trialed.
这句话最后two of ......从语法结构是不是伴随状语?
two of the methods being trialed.(这两种方法正在试验中)是状语不错。精确地说,是“补充说明”的状语。有时候“伴随”状语和“补充说明”状语很难区分的。