形容词
中文翻译：从属的
同义词：
['subordinate', 'inferior', 'subordinate to']
例句：
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1. The subordinate line is the one that connects the two main lines.
次级线是连接两条主线的那条。
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2. The subordinate line was used to indicate a smaller scale or lesser importance.
次级线用于表示较小规模或较低重要性。
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3. The subordinate line was drawn in a different color to distinguish it from the main line.
次级线被画成不同的颜色以与主线区分开。