I simply have a lot of experience, and I've seen my fair share of flotsam drifting down the sewer tunnel.

我只不过有很多经验，同时我也知我所说的不少东西都散落到下水道去了。

youdao

The thesis demonstrates the feasibility of natural ventilation to control concentration of noxious gas in the sewer tunnel.

并论证利用自然风稀释污水隧道内有害气体浓度的理论可行性。

youdao

With the deep tunnel system, the sewer reticulation system in Singapore will, in future, consist of only gravity sewers linked to deep tunnels.

与深隧道系统，污水管网系统，在新加坡，将在不久将来，构成只有重力下水道相连的深层隧道。

youdao

The Hammersmith MP said the Thames Tunnel - a super-sewer planned for London - was a "sensible solution" to the problem.

BBC: Raw sewage in Thames 'a disgrace' - Labour MP