However, in the conventional vacuum pumping tests, fine particles did not lost and there was clogging without arching structure layer.

而常规真空抽水方法中不存在细颗粒流失，没有形成拱架结构，造成了淤堵。

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However, in the conventional vacuum pumping tests, fine particles did not lost and there was clogging without arching structure layer.

而常规真空抽水方法中不存在细颗粒流失，没有形成拱架结构，造成了淤堵。

youdao