But in the lower reaches of the Yellow River region, frost first appears in late October or early November.
但在黄河下游的地区，最早在十月下旬或十一月上旬才出现霜冻。
The paper deals with the imminent problems on the lower reaches of the Yellow River with respect to flood and ice run protection and retarding channel aggradation, among others.
本文论述了黄河下游当前急待解决的防洪、防凌以及减缓河道淤积等问题！
Protection design for lower reaches of the Yellow River was once a difficult question due to high water head, various combinations of discharging structures, and complex flow pattern.
小浪底工程由于水头高、泄水建筑物组合多，水流流态十分复杂，下游防护设计是一难题。
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