英譯：
cross one’s bridges before one comes to them (or cross a bridge before one comes to it)
註：這成語字面的意思是「未到橋頭先著急」，即「事未臨頭先發愁」。
例句：
- Mary’s always crossing her bridges before coming to them. She needs to learn to relax. (瑪麗老是杞人憂天。她必須學會放鬆自己)
- Sometimes we have to face the reality, but don’t cross a bridge before you come to it. (有時我們必須面對現實，但也別杞人憂天、自尋煩惱)
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http://htmfiles.englishhome.org/idioms/idioms_chinese-1.htm