The supports under the bridge were starting to bend.

桥下的支柱开始弯曲。

《牛津词典》

These are the people who travel under the bridge instead of on it.

这些人是在桥下而不是在桥上通行的。

youdao

Marine construction technology like this is very complex, somewhat analogous to trying to build a bridge under water.

像这样的海洋建筑技术非常复杂，有些类似于尝试在水下建筑一座桥。

《柯林斯英汉双解大词典》

A special safety net was suspended under the bridge.

VOA: special.2010.07.23

These included a special safety net under the bridge.

VOA: special.2009.03.04

The river dips under Chelsea Bridge, past Battersea Park's Japanese pagoda and the Houses of Parliament.

BBC: Following the Thames: A source-to-mouth guide

They rejected, didn't want to talk to us, and so that's all water under the bridge.

NPR: Florida Weighs Options After Breaking Party Rules

The swift little mud swallows that nested under the bridge did an aerial ballet through it, gorging themselves.

NPR: Excerpt: 'World Made By Hand'