英语翻译

题目

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?

答案

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.