城门失火，殃及池鱼 = ask not for whom the bell tolls 偷鸡不成蚀把米 = have pie-in-the-sky hopes

Randy的答案倒是值得商榷，仅个人观点：-） 偷鸡不成蚀把米=go out for wool and come back shorn have pie-in-the-sky hopes 应该是白日梦更贴切吧 城门失火，殃及池鱼 =侧重殃及无辜bring trouble to innocent people Don't ask for whom the bell tolls 我认为侧重“相互关联，相互依存”