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更新日期：2016-06-29
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版本需求：Android 4.1 以上版本
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The river presents a very beautiful sight. It is a source of pleasure to us. In winter, spring, and early part of summer the water of the river remains calm. We know how pleasant it is to walk in the morning and evening by the side of a river. It is also pleasant to have a pleasure trip in a boat or steamer when the river is calm.
The river is a large stream of water. The river rises generally from a mountain or lake in a tableland. At first several very narrow streams of water join together and form one larger stream. This stream gradually widens in its course. On its way, it is joined by other smaller rivers. They are called its tributaries. At last the river falls into a sea, lake or another river. The mouth of the river becomes very wide. A river generally receives its water by the melting of snow on mountains. Sometimes it is fed by rain.
