没有几年管子就开始堵塞了。

Within a few years the pipes began to clog up.

《牛津词典》

通过对浆液输送管线上的浆液进行连续再循环运行，可以使浆液在管线中保持足够的流动速度以防止管子堵塞。

By continuously recirculation the limestone slurry within the feed loop, the limestone slurry will be maintained at a fluid velocity within the piping sufficient to prevent plugging.

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这管子时而堵塞。

The tube gets plugged sometimes.

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