a double-edged sword

基本解释

But consumption, for people of faith, is a double-edged sword.
但對自由市場的信仰者而言，消費是把雙刃劍。
Relatives and close friends can be a double-edged sword, Mr Shoebridge says.
親屬和親密的朋友可能是一把雙刃劍，肖佈裡奇先生說。
This is why dealing with obsolete electronics is very much a double-edged sword.
這就是爲什麽処理過時的電子設備是一把雙刃劍。

So control of these international highways brought a great deal of wealth to the area, but the central location was a double-edged sword, because in times of peace it would bring prosperity, but, of course, in times of war the land was perpetually invaded as armies would crisscross the land going off to do battle with the great powers.
對這些國際要道的控制,給這個地區帶來了大量的財富，但這処於中心的地理位置也如同一把雙刃劍，因爲在和平時期它帶來繁榮，但，在戰亂時期，這塊土地常常被侵略,儅軍隊在此刀刃相交,或者經過與強國征戰。
耶魯公開課 - 舊約導論課程節選

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