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I rang the bell, and a geeky, middle-aged man in bifocals stuck his head around the door.
我按响了门铃，一个头上架着变焦眼镜，看起来一付科技痴汉模样的中年男子从门后探出头来。
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Occasionally, children who have crossed eyes may need to have bifocals to help control the crossing.
偶尔有内斜视的孩子会需要双光镜来控制内斜。
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Take care when stepping on and off the escalator; take extra care if you wear bifocals.
在上下扶梯的时候一定要留神，尤其是当你还戴着眼镜的时候。
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