have dual functions ; pull double duty
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与此同时，加利福尼亚的新兴公司Pixel Qi所展示的液晶显示屏具备双重功能，既可实现彩色显示，亦能作为低功耗的黑白显示器。
Meanwhile, Pixel Qi, a California-based startup, is showing LCD displays that can do double duty as color screens as well as low-power, black-and-white displays.
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