名词
中文翻译：变色的轴承
同义词：
['discolored bearing', 'discolored bearing']
例句：
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1.The old car's engine was a discoloured bearing that needed replacing.
这辆旧车的发动机是一个变色的轴承，需要更换。
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2.The new design uses discoloured bearings to improve efficiency.
新设计使用了变色轴承来提高效率。
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3. The engineer carefully inspected the discoloured bearings before installing the new parts.
工程师在安装新部件之前仔细检查了变色轴承。