医生：我先给你打一针麻药。
龋洞很深，在钻牙前我将给您打一针麻药。
The decay is very deep, so I will use a local anesthetic before drilling.
医生：我先给你打一针麻药。你以前注射过麻药吗？
Doctor: First, I'll give you an injection of anesthetic. Have you had anesthetics before?
医生：我先给你打一针麻药。你以前注射过麻药吗？
Doctor: First, I'll give you an injection of anesthetic. Have you had anesthetics before?
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