在一个同步场景中，一个缓慢响应的外部资源或完全利用的连接池将捆绑上游线程，直到该瓶颈得到缓解。

In a synchronous scenario, a slowly responding external resource or fully utilized connection pool will tie up the upstream processing threads until the bottleneck is alleviated.

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在坝的上游一侧，原来是个很深的水池，而现在一眼看去却是一片平坦的暗绿色的冰池。

Above the dam there was what ought to have been a deep pool but was now, of course, a level floor of dark green ice.

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游戏区域都在一个个圆圈内，包含沙池、水上游戏区、攀爬区、绘画区等。

There are rubber surfaces, grass surfaces, play areas in circles, including sandboxes, a water game area, a climbing area, an area for drawing, etc.

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