你应该在四点钟左右回到游客中心。
You should be back at the Visitor Centre at about four o'clock.
游客中心有各种明信片以及其他纪念品出售。
A wide range of postcards and other souvenirs are on sale in the visitors' center.
如果你们看着地图，会看见游客中心，它在地图底部、入口旁边，我们现在就在这里。
If you look at your map, you'll see the Visitor Centre, where we are now, at the bottom, just by the entrance.
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