opportunity knocks but once

常见例句

雙語例句

• Opportunity knocks but once.
  良機難再。
  《新英漢大辤典》
• Opportunity knocks but once, so we must make the most of it.
  機不可失 ，失不再來，所以一定要把握時機。
• We believe in the old saying, "Opportunity knocks but just once, " so we always welcome it and devote all our spirit and efforts to it.
  我們相信，在這個古老的諺語說：“機不可失，但衹有一次”，所以我們一直歡迎它，把我們所有的精神和努力。
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