Safety contours were traced, obstacle areas were computed, and navigable areas were acquired.
通过追踪安全等深线和处理障碍区，得到可航渡区域。
Article 3 the operations of domestic waterway transport are classified into the coastal transport and the inland-water transport on the basis of navigable areas.
第三条国内水路运输经营按照航行区域分为沿海运输和内河运输。
Article 3 the operations of domestic waterway transport are classified into the coastal transport and the inland-water transport on the basis of navigable areas.
第三条国内水路运输经营按照航行区域分为沿海运输和内河运输。
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