In October,
10月
Autumn falls on the plain areas in Hubei and Hunan.
长江中游的两湖平原进入秋季
In Hubei, the water level of the lakes,
湖北省内 临近长江的湖泊水位
Close to the Yangtze, begin to drop.
开始逐渐下降
The laws of nature provide people,
这个自然规律
With an opportunity to reach the bottoms of the lakes.
使人们有机会接近湖底的世界
n. 机会,时机