They found that two hours of sitting before a bright screen at night reduced the sleep chemical levels by about 22%.
他们发现,晚上坐在明亮的屏幕前两小时,会使睡眠化学物质水平降低约22%。
Don't go blind squinting at that bright screen.
千万别因为长时间盯着电脑而变成盲人。
A large bright screen is placed on the ground of a spacious darkened room.
一个宽大而明亮的屏幕摆放在一间宽阔而黑暗的房间的地面上。
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