的确， 真话是最难听得进耳也最难说得出口的。
Truth, indeed, is a thing that is most painful to listen to and most painful to utter.
第一，用户会愿意购买该产品这点最重要，也最难达到。
First, users will choose to buy it, so it's actually the hardest and most important.but they will choose to buy it, will choose to use it.
各种厨房用品中，目前可以说油是最混乱的，也最难监管。
Among the variety of kitchen supplies oil is the most chaotic and the hardest to regulate.
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