难治 meaning in Chinese

obstinacy
refractoriness
refractory to treatment

Reflux leads to recurrent or refractory aspiration pneumonia .
反流可引起复发的难治的吸入性肺炎。
Occasionally it may cause clinically troublesome hyperviscosity .
偶尔它可以引起临床上难治的高粘度症。
And as a doctor i suffered from two very difficult diseases .
而且做了医生后，我又害了两种难治的大病。
Environmental lead contamination and refractory rickets
环境铅污染与难治性佝偻病
The treatment of refractory depression with mirtazapine
米氮平治疗难治性抑郁症的初步观察

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