Totally 23 cases of traditional block anesthesia had pumpback blood，needing to change direction and reinject.
直接麻醉法有23例注
麻药前回抽有血，经
向后重新注;
Totally 23 cases of traditional block anesthesia had pumpback blood，needing to change direction and reinject.
直接麻醉法有23例注麻药前回抽有血，经向后重新注;
声明：以上例
、词
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