Letter alike，interclass difference quiet；letter different，interclass difference patency.

母相，差不；母不，差。

Hydrotubation, patency of tubes were observed and compared with hysterosalpinograms (HSGs) the fertile situation after operations of sterile patients was tracked.

观察输卵管通液情况及其与子宫输卵管碘油造影(HSG)结果比较；追踪不孕症患者术后受孕情况。