Sam was dredging the drainage ditch behind the town dump when the downpour began .
开始下倾盆大雨时山姆正在镇垃圾场后面疏浚排水沟。
Clp 's environmental permit bans dredging during the breeding seasons .
中华电力获得的环保许可，禁止其在动物繁殖期间进行挖掘。
Fishing , dredging and other activities , including wind turbines , are to be banned or restricted on at least 15 new sites around the coast , ranging from norfolk to cornwall and northern ireland .
