Since you are quite a newby on Cucumis, of course you still don't know exactly how things work.
When an expert is evaluating a translation from a source language he doesn't know, he will probably set a poll asking for the help of the community to check the accuracy of the meaning or, he can ask for a bridge from one of the official bridgers, those are the experts for the source language and the power cucumers whose mother tongue is the source language.