He mounted his horse, and when he came to the cave he alighted, tied his horse to a tree, then approaching the entrance, and pronouncing the words, "Open, Sesame!"

他骑上马，当他来到这个他偶遇的山洞，把马绑在树上，然后接近入口，念起咒语，“打开，芝麻！”

youdao

A natural opening, as the part of a stream or river that empties into a larger body of water or the entrance to a harbor, canyon, valley, or cave.

河口一个自然形成的开口，作为溪流或河水的一部分，可通过此口流入更大的水域或港湾、峪或洞的入口。

youdao

The entrance to the cave is on a plateau in the dauphine alps.

此洞穴的入口在多芬阿尔卑斯山的一个高原上。

youdao

There is a small information office 2.6km outside the town of Perusic, which marks the entrance to the Grabovaca Cave Park, with a rough trail then leading a further 2km through a flat meadow and up a short steep hillside to the cave entrance.

BBC: Croatia��s adventurous heart