底部接触 meaning in English

basal contact
base contact

The resistance of navigating vessel would be cut down and lead to the purpose of improving the velocity or decreasing the power of main engine while maintaining the velocity , if the technology of reducing the friction by microbubbles jetted from the bottom of vessels , which makes the water close to the vessel ' s bottom become the mixture or water and microbubbles and form a thin gas layer , could be applied in ships
如果把微气泡减阻技术应用到船舶上，在船舶底部喷射微气泡，使与船舶底部接触的水变成水与微气泡的混合液，形成一薄层气膜紧贴在船底表面，就可以达到提高航速或航速不变减小主机功率的节能目的。