【Haichuan Equipment Guessing Game】A small mirror, related to safety

2021-04-12View Original

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I saw it online; there are such devices on some bridges. Have you seen them?

Reply #22021-04-12

I really haven’t seen it before. . . What’s the use of this?

Reply #32021-04-12

Choose the right one; it’s not necessary to go for the most expensive one.

Reply #42021-04-12

Well, I don’t know; I guess I’ll just wait for an expert

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【Haichuan Equipment Guessing Game】A small mirror, related to safety

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