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No longer draining the marsh at the expense of the reed beds, the water authority is discovering that slower drainage means fewer floods downstream and cleaner taps in the city.

水务部门不再以芦苇荡为代价排干沼泽，它正发现：放缓排水意味着下游洪水更少、城市自来水更清。

No longer doing A 置于句首表转变，at the expense of 点出旧做法的代价，主句用 is discovering that... 给出新认识。

The clearest emblem of the city's shift is a restored creek, which curls behind three housing blocks that had long used its bank as a dump.

这座城市转型最清晰的象征是一条修复后的小溪：它蜿蜒在三片住宅楼之后，而这些楼曾长期把溪岸当作垃圾场。

The clearest emblem of X is Y, which...that... 用双重定语从句逐层介绍地标及其今昔变化。

Only a fifth of the roof terrace is reserved for tables and chairs. The rest is left for low-growing plants, such as sedum and creeping thyme, and sown with wildflowers to cool the building below.

屋顶露台只有五分之一留给了桌椅。其余部分留给低矮植物，如景天和匍匐百里香，并播撒野花，为下方的建筑降温。

用 Only 加分数先说少数用途，再以 The rest is left for 交代其余安排，形成分配上的对照。