这一发现具有非常显著的临床意义，因为在美国，外用阿奇霉素是最常用的MGD治疗药物，但它是作为标签外（off-label）的治疗药物，这意味着该药物的疗效尚未得到评估和FDA的批准。
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医生有处方药物使用于未批准用途的自由，但是法律禁止制药公司销售药品用于标签外的用途。
Doctors are free to prescribe drugs for USES that have not been approved, but drug companies are prohibited by law from marketing drugs for these so-called "off-label" USES.
除允许用户向其图书馆添加图书外，Google Book Search API还允许用户向图书添加评论和标签。
In addition to allowing users to add books to their library, the Google book Search API also allows them to add reviews and labels to books.
<many-to-many>标签中的column属性用来指定连接表与目标类的映射表链接的外键。
The <many-to-many> tag's column attribute specifies the foreign key column in the link table that relates the link table to the mapping table for the target class.
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