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英语翻译The slope averages about 1 in 30,but contains steep,prob

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英语翻译
The slope averages about 1 in 30,but contains steep,probably vertical,cliffs,and gentlesediment-covered terraces,and near its lower reaches there is a long tailing-off which is almost certainly the result of material transported out to deep water after being eroded from the continental masses.
参考译文:坡度平均约为1/30,但其中包括陡峭的、乃至垂直的峭壁和沉积物覆盖的缓和的阶梯地带,在这个地带的低处是很长的一段尾沙地段,基本上可以断定这个地段是大陆块体上侵蚀下来的物质被水冲到深水处形成的.
and near its lower reaches there is a long tailing-off 1.这个reach应该是什么意思 2.tailing-off是固定词组么?尾沙地段?
英语翻译The slope averages about 1 in 30,but contains steep,prob
each这里是做名词表示延伸,范围的意思.lower reaches从文中来看就是低处.
tailing-off应该是个词组表示尾沙地段