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the chinese x is something between "s" and "sh", I was told it sounds a bit like the sh sound in "magic", but I mostly pronounce it as "sh", my ears can't tell the difference yet :)
The meaning depends on the characters used, there are so many characters pronounced the same way, that you can't tell the meaning simply with the prononciation.
But the character meaning "star" is for sure pronounced as "xing" (at least in mandarin)