opportunity knocks but once

常见例句

双语例句

• Opportunity knocks but once.
  良机难再。
  《新英汉大辞典》
• Opportunity knocks but once, so we must make the most of it.
  机不可失 ，失不再来，所以一定要把握时机。
• 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.
  我们相信，在这个古老的谚语说：“机不可失，但只有一次”，所以我们一直欢迎它，把我们所有的精神和努力。
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