沟渠、排水沟、檐沟、沟壑

1. ditch, drain, gutter, trench

noun (common) (futsuumeishi)

沟槽，胎面，凹痕

2. groove, tread, indentation

noun (common) (futsuumeishi)

鸿沟（人际间、国家间等的），裂痕，裂隙

3. gap (between people, countries, etc.), gulf, rift

noun (common) (futsuumeishi)