1. I am counting down the number of radiation treatments that I have left. I am so looking forward to the end of them.2. I am counting down the days until the long weekend.3. We do the New Year countdown at Times Square every year.4. You have ten seconds to accomplish your mission. We are counting down now. 10, 9, 8,..5. Although I sometimes do the New Year countdown with my friends, I have never understood the point of it.
 countdown count downcount down 是倒數計時的正統翻譯。倒數我的治療療程次數 = count down the number of radiation treatments that I have left倒數連假前的天數 = count down the days until the long weekend