英语翻译In the past,land scoured away from the coastline by the currents of the Mediterranean Sea used to be replaced by sediment brought down to the delta by the River Nile,but this is no longer happening.句中有三个by,哪个先翻译?

英语翻译In the past,land scoured away from the coastline by the currents of the Mediterranean Sea used to be replaced by sediment brought down to the delta by the River Nile,but this is no longer happening.句中有三个by,哪个先翻译?
英语翻译
In the past,land scoured away from the coastline by the currents of the Mediterranean Sea used to be replaced by sediment brought down to the delta by the River Nile,but this is no longer happening.句中有三个by,哪个先翻译?

英语翻译In the past,land scoured away from the coastline by the currents of the Mediterranean Sea used to be replaced by sediment brought down to the delta by the River Nile,but this is no longer happening.句中有三个by,哪个先翻译?
主干:"Land scourned away...is no longer replaced by sediment."
独立的句子:(1) In the past,land were scourned away from the coastline by 被 the currents of the Mediteranean Sea;
(2) that land used to be replaced by 被 sediment brought down to the delta by the River Nile.
(3) (Today/Now) This is no longer happening.

在过去，地中海的水流冲刷海岸所带走的土地是被尼罗河携带到三角洲的沉积物所补充替代的，然而这种情况现在已经不再发生了。
主干是land used to be replaced, but this is no longer happening. 这是个but连接的表转折的并列句。
三个by的翻译见上，关系如下：
1. scoured away by the currents

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在过去，地中海的水流冲刷海岸所带走的土地是被尼罗河携带到三角洲的沉积物所补充替代的，然而这种情况现在已经不再发生了。
主干是land used to be replaced, but this is no longer happening. 这是个but连接的表转折的并列句。
三个by的翻译见上，关系如下：
1. scoured away by the currents
2. replaced by sediment
3. brought down by the River Nile

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最纯粹的主干是 land used to be replaced, but this is happening
在过去， 地中海的波浪侵蚀海岸线所带走的泥土，是由尼罗河从上游携带到三角洲的沉淀物来补充的，但现在已经不可能了。
句子意思清楚了，相信你已经知道by是怎么回事了。
以后遇到难懂的句子，词不认识就查，不要相信任何所谓的分析方法，（老师教的基本方法还是要用的）。你能搞...

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最纯粹的主干是 land used to be replaced, but this is happening
在过去， 地中海的波浪侵蚀海岸线所带走的泥土，是由尼罗河从上游携带到三角洲的沉淀物来补充的，但现在已经不可能了。
句子意思清楚了，相信你已经知道by是怎么回事了。
以后遇到难懂的句子，词不认识就查，不要相信任何所谓的分析方法，（老师教的基本方法还是要用的）。你能搞定的！

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