レコードの溝[rekoodonomizo] record groove
下水溝[gesuikou] drainage ditch
海溝[kaikou] ocean trench
溝渠[koukyo] ditch
溝鼠[dobunezumi] brown rat (Rattus norvegicus)

畝溝[unemizo] furrow ridges
側溝[sokkou] gutter
排水溝[haisuikou] drainage
蘆溝橋[rokoukyou] Marco Polo Bridge (China)