plugging

She keeps plugging away at French.

她直在拼命地学法语。

It is commonly caused by chronic alveolar hypoventilation or air way mucus plugging.

究其原因，可能为肺泡慢性通气不足或气道分泌。

MDP 952 agent for profile control and water plugging is a mixture consisted of xylolite flour, hardening agent and some chemicals.

MDP-952调堵剂是由菱苦土粉与硬化剂及些化学助剂组成的混合。

The cleaner hereinabove should not leave the workplace with the key still plugging in the cabinet lock or in an unlocked drawer or the cabinet.

阿姨在作场所时，不得将个钥匙遗留在橱柜上或未锁的抽屉、橱柜中。

The causes are presented as follows: packer unloading pressure, formation damage, oil tool plugging, formation voidage, the worst formation physical properties and the effect from vicinage wells.

地层污染或具堵;地层欠压;地层性极差;邻井影响等。