There is something uniquely unsettling about sending a sample of your own poo in the post — as I, and hundreds of thousands of us, have been doing lately — to work out the state of our guts.
把自己的一份粪便样本寄出去——正如我和成千上万的人最近一直在做的那样——来判断肠道状况，这件事有一种格外令人不安的感觉。
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