meal ticket 餐券，饭票；一部分人的生活来源和保障
a.Nancy doesn't really love her rich boyfriend at all;she just takes him as her meal ticket.
南希根本不爱她那个有钱的男友，只是把他当成能够提供生活来源的饭票罢了。
b.Her English skills will be her meal ticket when he goes into foreign trading.
她良好的英语技能是她从事外贸行业的成功保证。

leave well alone 不要没事找事、多此一举；见好就收，适可而止，不要画蛇添足
You should leave well alone and be happy with your essay the way it is.
你应该对你的论文感到满意了，不必在去画蛇贴足。
leave sb./sth.alone 把某人或则某事放在一边不加理睬，不去管
leave me alone 别烦我，别惹我，滚开

Music：How Deep Is Your Love-Bee Gees
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