As this occurs, we should see the impact of these events on prices start to reverse.

当这种情况发生时，我们应该会看到这些事件对价格的影响开始逆转。

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As this occurs, valve springs pull the valve tightly closed against its opening, called the valve seat.

当这发生时，气门弹簧紧紧地封闭气门口，叫做气门座。

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However, there could be a very logical and compelling reason as to why this occurs so often.

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There are no good estimates as to how often this occurs.

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That share was down just 0.1 percentage points from November - a much smaller fall than usually occurs as this time of the year, when more shoppers typically head for the High Street for their Christmas purchases and for the Boxing Day sales.

BBC: UK retail sales fall in December