Question2: why do you think youngsters will be into tattoo?
问题2：你觉得为什么年轻人会喜欢文身呢？
Question2. What do you need to know in order to find out the sample size calculation in a RCT?
在随机对照试验中进行样本量计算你需要知道哪些内容？
Question2: you know, many people are reluctant to request someone, especially a stranger to offer help.
问题2：你知道，许多人不愿求人，尤其是向陌生人求助。
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