n. 
层;底层;子层
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cathode-ray,
cathodic,
cathodochromic,
cathodochromism,
cathodoelectroluminescence,
cathodogram,
cathodograph,
cathodoluminescence,
cathodolumine-scence,
cathodophone,
相似单词
subcloning,
subcloud,
subcloudcar,
subclutter,
subclypeate,
subcoat,
sub-coat,
sub-coating,
subcode,
sub-coefficient,