I'm no expert in Chinese, but Google says the title means "The Earth is not worth fighting."
Get it, because Mei is Chinese, and her phrase is "the world is worth fighting for."
Look, it's 2300 (11PM) and I'm tired.
Oh yeah, here's a thing: my dad is broke and I'm just a student, so that annoying twat "Bill Cable" hasn't gotten his money yet. Everything until further notice is being posted from my phone.