双刃剑:double-edged sword在现在和我们过去的生活中，它都是一柄双刃剑，会使人越来越窒息、也会使人由空虚变得有信仰。 It's potential for good or evil, now and in the years of our lives, smothers exaltations and converts vanity to prayer
最普通:Every coin has two sides.较好用法：Anything is a double-edged sword 高级用法：Every cloud has a sliver lining. A rose has its thorns. For every plus there is a minus.
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