否则，你不明白你买的是什么，不明白什么时候出售，而且你不能准确地评估你受到的建议。
Otherwise, you won't know what you're buying; you won't know when to sell; and you can't accurately evaluate the advice you're given.
除非真的想要，否则别买你买不起的东西。
Do not buy stuff you cannot afford, unless you really want to.
刚才进店的时候，你应该装出除非价格能便宜点否则不会买的样子。
You should have come in (this store) pretending you wouldn't buy it unless the price was cheaper.
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