Translation:The world undergoes a crisis, people know it.
Your proposed solutions all have errors in them. This is pretty close to exact: "The world is in crisis, this we know"
I like: "The world is in crisis, we know it". I agree with you that the official answer doesn't really seem to come from the French.
I took the sentence to be a response to somebody's rant...Allright, allright, the world is in crisis, we know it. ...Now what?
I guess Duo's take is more like a summary in the historical present.
The first world war starts
Millions are killed
The world undergoes a crisis, people know it.
Literature and art are changed forever.
Duo places a problematic sentence in front of students
The Green Owl swoops.
Things are back to normal.
Thanks for attempting to "de-politicize" this one. Far-left is so pervasive.
I like your answer as well, it is a better English translation of the French phrase.
Strictly speaking, "this" would require a demonstrative pronoun, e.g. on sait cela, but this isn't a terribly common turn of phrase in French.
It's bad English, a run-on sentence. It should at least have a semi-colon in there. "The world is in crisis; we know it." So, would the French really say it as Duolingo has it or would it be more like: "le monde est en crise, qu'on sait." ?
Although no one has answered my question, I have since seen a lot of sentences like this. It's very likely a perfectly valid sentence in French. But as you stated, it cannot be written in English with a comma, because that would be a comma splice.
It is indeed a valid use of punctuation in French (but I agree they should translate it with a semicolon).
I tried the same (with "in a crisis"). What a shame Game of Thrones hasn't conquered the English dictionaries yet :P
Why "undergoes" instead of "is." Is the French phase "est en <noun> commonly translated this way?
My guess is that the closest English would be "The world is in crisis, as we know."
How would one know to use a comma here instead of a period if this were spoken? The pause by the computer voice made me think that a period should be used. Furthermore, this is a comma splice in English and a period must be used. But I see commas used in French like this all the time.