But we were trying to address three key problems that plague digital projectors: lack of brightness, lack of contrast, and lack of sharpness.

但是我们一直试着解决困扰数码放映机的三大难题：亮度较低，对比度较差，清晰度不足。

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Type the date two to six lines down from the letterhead or return address. Three lines below is the standard.

在信头或者回复地址下面2 ~6行输入日期，3行为标准。

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Type the date two to six lines down from the letterhead or return address. Three lines below is the standard.

在信头或者回复地址下面2 ~6行输入日期，3行为标准。

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