心向着谁
英语：[Double-blade sword] a mixedblessing；two side sword；拼音：[Shuāng rèn jìan]释义：两面都有刃的剑 用来形容事情的双重影响性，既有利也有弊。示例：计划生育就是双刃剑，好处是控制了人口过快增长，弊端是多年后将造成人口老龄化
蝴蝶圆舞曲
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.
