论述了电触头的材料转移现象。
建立了一个选择性转移效应模型来解释此现象。
A selective transfer effect model was established to explain the phenomena.
现在的问题是我们怎么阻止这种现象的再次出现和转移？
Now, the problem is how we stop the phenomena to happen again and avert?
恶性肿瘤骨转移是十分常见的现象，诊断和治疗并不十分困难。
Bone metastases of cancer are common phenomenons without difficult diagnoses and treatment usually.
恶性肿瘤骨转移是十分常见的现象，诊断和治疗并不十分困难。
Bone metastases of cancer are common phenomenons without difficult diagnoses and treatment usually.
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