在20世纪80年代，普及率达到很高的水平，然后停滞不前，因为面临顽固的障碍，例如我们在根除脊髓灰质炎和麦地那龙线虫病的最后阶段中所见到的障碍。

In the 1980s, coverage reached a high level and then stagnated, facing stubborn obstacles like those we see in the last stretch of polio and guinea worm eradication.

youdao

在20世纪80年代，普及率达到很高的水平，然后停滞不前，因为面临顽固的障碍，例如我们在根除脊髓灰质炎和麦地那龙线虫病的最后阶段中所见到的障碍。

In the 1980s, coverage reached a high level and then stagnated, facing stubborn obstacles like those we see in the last stretch of polio and guinea worm eradication.

youdao