At the end of twenty steps the corridor ended in a jumping-off place.
走了二十步，通道往下到了尽头。
They went on, and presently entered and followed Tom's other corridor until they reached the jumping-off place.
他们继续往前走，不一会就走了进去，沿着汤姆的另一条通道，一直走到低洼处。
The search is one of jumping-off place of Internet.
搜索是互联网的出发点之一。
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