irrigate
v[Tn]
1 supply (land or crops) with water (by means of streams, reservoirs, channels, pipes, etc) 灌溉(田地或作物)
irrigate desert areas to make them fertile 灌溉荒芜地区使之肥沃.
2 (medical 医) wash (a wound, etc) with a constant flow of liquid 冲洗(伤口等).
It soon became clear that the straight part of the dance changed when the sun's position changed. If the feeding place was toward the sun, the dancer headed straight upward during the straight part of the wagging dance.