• 1. a knock out: 击倒 | 美得让人倾倒 | 打到
• 2. a knock-out: 一个非常漂亮的人

• 1.Clinton has lost 11 straight nomination contests to Obama since 5 February, and Clinton supporters were hoping for a knock out blow in the debate that would reverse his momentum.
  自从2月5号以来，克林顿参议员已经在和奥巴马的党内候选人提名的初选中连续在11个州落败，克林顿的支持者希望她能在辩论中有出色的表现，挫挫奥巴马的锐气。
  dict.yoduao.com
• 2.At that second knock, a window on the third floor opened and the same Snail looked out.
  第二次敲门时，三楼的一扇窗户打开了，还是那只蜗牛往外看。
  dict.yoduao.com
• 3.Keep logs to study your online profile and decide what you can knock out, download a program like Freedom that locks you out of your browser, or take a "digital Sabbath".
  保持记录，研究你的在线资料，并决定你可以删除什么，下载一个像Freedom这样的程序，使你远离浏览器，或采取 "数字安息日"。
  dict.yoduao.com

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