Two lines cross at right angles.
两线成直角相交。
The two lines cross at right angles.
这两条线互成直角。
A vessel shall, so far as practicable, avoid crossing traffic lanes but if obliged to do so shall cross on a heading as nearly as practicable at right angles to the general direction of traffic flow.
船舶应尽可避免穿越通航分道，但如不得不穿越时，应尽可能用与分道的船舶总流向成直角的航向穿越。
A vessel shall, so far as practicable, avoid crossing traffic lanes but if obliged to do so shall cross on a heading as nearly as practicable at right angles to the general direction of traffic flow.
船舶应尽可避免穿越通航分道，但如不得不穿越时，应尽可能用与分道的船舶总流向成直角的航向穿越。
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