8.2

今日长难句

That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.（Text3. 2006）

maximum / ˈmæksiməm / adj.最多的；最大极限的

sustainable / səˈsteinəbl / adj.可持续的

yield / ji:ld / n.产量；产出；利润

crop / krɔp / v.有收成

fishery / ˈfiʃəri / n.渔场

biomass / ˈbaiəumæs / n.生物量

target / ˈtɑ:ɡit / n.目标；指标

species / ˈspi:ʃi:z / n.物种

original / əˈridʒənl / adj.原来的；起初的

结构分析

你需要知道

本句为嵌套结构。主干That matters后接原因状语从句because...，原因状语从句中嵌套宾语从句that the maximum sustainable yield...comes，宾语从句中又嵌套了一个定语从句that can be cropped from a fishery.和一个时间状语从句when the biomass...。

翻译

而这很重要，因为理论认为当目标物种的生物量大约为其原始水平的50％时，从渔场能够获得最大的可持续产量。

预告明日长难句

Today, surrounded by promises of easy happiness, we need art to tell us, as religion once did, Memento mori: remember that you will die, that everything ends, and that happiness comes not in denying this but in living with it.（Text4. 2006）