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1. The lines on his forehead are a testament to the passage of time.
他额头上的皱纹见证了时间的流逝。
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2. As he grew older, his face began to show signs of aging.
随着年龄的增长,他的脸部开始显示出衰老的迹象。
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3. The doctor examined his forehead and found no signs of trauma or illness.
医生检查了他的前额,没有发现任何创伤或疾病的迹象。