The lamp cast (投射) a dim glow (昏暗的光) over the room. My vague (模糊的) shadow was reflected (反射) on the surface of the desk. It was 11 o’clock at night. Looking at the still-unsolved problem, which I had tried to solve so many times, I felt my efforts were just in vain (徒然). It seemed that I had no choice but to give up.