If opportunity doesn't knock, build a door.
如果机会没来敲门，那就自己开一扇门吧。
If opportunity doesn't knock... build a door.
如果机会不来敲门，那么你就造一个门吧。
If you build a better mouse trap, people will be packed at your door.
如果你的老鼠夹做得比别人好，上门的人就会络绎不绝。
If a door closes on you! Build another one!
如果一扇门对你关闭，那就再造一扇门！
If a door closes on you! Build another one!
如果一扇门对你关闭，那就再造一扇门！
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