1. Prescriptioned sun glasses; 2. Transition glasses; 3. Clip ov

来源: leilei123 于 2011-06-25 19:55:04 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (232 bytes)

1. dark, which cut down light so it has difficulty to see clearly inside.

2. It turns dark outside, and becomes clear inside.  Howevere, some people feel it is not dark enough outside.

3. Easy, practical.

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