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axis of channel
el.	通道轴线
hydroel.st.	深泓线; 河槽几何轴线
hydrol.	航道中线
tech.	水流动力轴线; 河道中泓线; 河槽轴线; 航道轴线; 航道中心线
water.res.	河轴线; 河流谷底线