它不仅是美国最长最深的石灰岩洞穴之一，也是世界上最长最深的石灰岩洞穴之一。
It's one of the longest and deepest limestone caves not just in the country but in the world.
在这种碳酸的帮助下，流动的水创造了世界上大部分的石灰岩洞穴。
With a little help from this carbonic acid, moving water forms most of the world's limestone caves.
据美国有线新闻网3日报道，一个国际科学小组宣布，他们在月球上发现了一个又大又深的垂直"熔岩洞"，可能适宜人类移民月球或修建月球基地。
An international team of scientists say they've discovered a protected lunar "lava tube" - a deep, giant hole - that might be well suited for a moon colony or a lunar base, CNN reported Sunday.
网上的一张照片显示华山被云雾笼罩，其他一些照片上则是很多上了年纪的游客，以及女性和儿童聚集在山顶索道站附近的一个岩洞内的情景。
One photograph online showed fog and mist enveloping the mountain, and others showed many elderly tourists and women and children gathered in a cave near the mountaintop cable car station.
从北京到桂林的旅游线路，你可以先去著名的漓江，坐在小舟上欣赏美丽的景色，然后可以去银子岩，那是中国第4大岩洞。
From Beijing to Guilin tourism line, you can go to the famous Lijiang River, sitting on the boat to enjoy the beautiful scenery, and then can go to Yinzi Yan, it was China's first large cavern 4.
七星岩在漓江东岸，是桂林最著名的岩洞，分上、中、下三层。 洞内有地下河，地下画廊，以及许多石钟乳、石笋、石柱等。
Qixingyan in the Lijiang River on the east coast, is one of Guilin's most famous caves, divided into upper, middle and lower three floors.
七星岩在漓江东岸，是桂林最著名的岩洞，分上、中、下三层。 洞内有地下河，地下画廊，以及许多石钟乳、石笋、石柱等。
Qixingyan in the Lijiang River on the east coast, is one of Guilin's most famous caves, divided into upper, middle and lower three floors.
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