This line came from 深呼吸 by Yu Quan 羽泉。 迫不及待 - anxious to wait 开始倒计 - begin counting down
Would it just be translate as 'anxious to wait, I begin to count down'?
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开始倒计 - begin counting down (which means the thing you are waiting for will start soon)
I believe 开始倒计 is just an unusual weird abbreviation for Chinese rhythm. People normally say 开始倒计时 to mean "start the countdown".
开始 start, begin
倒计时 (verb) count down, (noun) countdown
Chinese rhythm requires four characters per pause, therefore it is unusually abbreviated to 开始倒计.
迫不及待 is an ancient Chinese idiom for "can't wait anymore".