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What’s not clear is why the switch flips “off” as we get older.

还不明确的是，为什么当我们变老的时候这个开关会关上。

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In this aspect of web search, it's clear that no single company has yet to dominate. However, even if a non-Google company surges ahead, it may not be enough to get people to switch engines.

在深度网络搜索方面没有绝对的强者，但只要该领域内的领先者不是Google，人们不会轻易切换搜索引擎。

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It is not yet clear how much the switch would cost if rolled out to all of Norfolk's 1, 500 officers.

BBC: Norfolk Police officers trial collar-and-tie uniform

Dietzen believes that the logic for the switch is clear to customers.

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The second, called electrochromic, requires voltage to switch the transparency from clear to opaque.

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