1 云海

Cloud Sea

云海为黄山五绝之一，是适宜的空气湿度和风速下形成的云层，且云顶高度低于山顶高度。

The cloud sea is one of the five wonders of Huangshan mountain. It formed under suitable air humidity and wind speed，and the cloud top height is lower than the height of the mountain.

瀑布云是一股气势宏大的快速云流，迅猛磅礴，澎湃汹涌。瀑布云来时，似天幕下落，如长练垂地，景致异常壮观，被誉为“银河倒泻”“白龙窜谷”。瀑布云通常仅持续10～30分钟，非常难得。

The waterfall cloud is a huge，fast flow of clouds. Waterfall clouds come，like the sky fall，such as long practice to the ground.It is known as“the Milky Way pouring down”for its spectacular scenery. Waterfall clouds usually last only 10～30 minutes，which is very rare.(https://www.daowen.com)

气象学上，将云分为层云、卷云、积云，其形态分别为一层一层、一缕一缕、一团一团。而流云，观景之人将其视为流动的云，实为热力或动力原因在不稳定的大气层内产生对流所形成的积状云。

Meteorologically，clouds are divided into stratus，cirrus and cumulus. They are in the form of a layer，a wisp and a group. And floating cloud，the viewer sees it as a moving cloud. In fact，it is caused by convection due to heat or power.