督脉是人体奇经八脉之一,督有总管、统帅之意,六阳脉皆交会于督脉,督脉有调节阳经气血的作用。
参考答案:对
It’s the third time that Li Ming has been to Xi’an , _______?
A.isn’t he
B.hasn’t he
C.isn’t it
D.hasn’t it
规范语体