Duolingo gives several translations, including ones that may not apply to the current context. The translation "flesh" can for example be used in certain biblical contexts, like "Der Geist ist willig, aber das Fleisch ist schwach" but not when you talk about eating where the translations should be "meat".
This is another case of having no ability of telling what the correct answer is?
"Sie essen Fleisch" - They are eating meat. "Sie essen Fleisch" = You (form.) are eating meat.
I put "You are eating meat" as the verb is conjugated with -en, but both You (form.) and They conjugate verbs with -en and there is nothing in the sentence (that I know of) to tell me the difference? If I am wrong please tell me, or is this just another one of those German sentences where you can't infer which "Sie" is meant?
Yeah, my initial impression is that the statement "Sie essen Fleisch" can only be understood when the context is given. I understood the Sie to be "They" and not "You (form)" this time because I don't think we've been taught the latter in Duolingo yet. Of course, we could have learned both uses from other sources beforehand...
For those of you that say that this sentence has no way of determing if this is she or they, here is an explanation of how to tell.
sie essen = They eat
sie isst = she eats
Sie essen = You eat (Formal replacement of both Du isst und sie essen, so both you and they)
Sie essen = They eat (Formal replacement of Ihr esst)
Note that the capital S denotes the difference between formal and informal. However, if sie starts a sentence it will always be capitalized regardless of whether it's formal or not.
If you see "Sie essen" on Duolingo at the start of a sentence, it should accept "You eat" or "They eat". This is due to the fact that formal and informal "they" are the same, and so is formal "you", and they all share the same verb form.
Keep in mind that if you see "sie essen" in the middle of a sentence, if it doesn't have a capital S, it can only be "they eat" and it is informal. If it has a capital S, it can only be "You" or "They" formal.
The way you would tell the difference in life is by the situation and surrounding context, but it doesn't matter for Duolingo.