Apple's operating system to write out what language?My question is,Mac OS X operating system is what computer language written by?

Apple's operating system to write out what language?My question is,Mac OS X operating system is what computer language written by? operating 取英文名,要带有sy的 P.S sylvia Apple of one's Apple of one's Apple's mistake 翻译 Eve’s apple a dam's apple apple juice 是哪个+s What（ )this?It's( )apple The apple in one's It's your apple red It's your apple red sy是什么意思 sy是什么意思 LL SY sy 是什么意思? What,s that?It,s（）apple.