A metaphor emphasizing the importance of choosing friends wisely, as one is easily influenced by the company they keep, just as cinnabar will always appear red regardless of where it is stored.
我们从小就被教导，交朋友要像“丹之所藏者赤”一样谨慎，因为朋友会对我们产生深远的影响。
We were taught from a young age that choosing friends requires the same caution as 'what cinnabar stores is red,' because friends can have a profound impact on us.
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