This is why we talk about the 'jet stream' in the upper atmosphere.
这就是为什么我们谈论'喷流'的上层大气。
The influence in the upper reaches is larger than the lower stream.
而且，上中游河段受影响大于下游。
The bog in upper stream formed early, and had begun in early Middle Holocene;
上游形成时间较早，始于中全新世前期；
The bog in upper stream formed early, and had begun in early Middle Holocene;
上游形成时间较早，始于中全新世前期；
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