I think the *best* way to do it is to have the translation as a facing page or facing column. This is what paper books do, and it has the advantage of not getting in the way if you are cruising through the target language, but it's easy to slide directly over to the appropriate sentence in the translation if you get stuck. I know that there are practical difficulties doing this on an e-ink reader, but I think it is by far the best system for language learners.
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