The levelness may be due to the subduction of a submarine mountain range known as the Juan Fernández Ridge.
板块的水平程度可能取决于一个被称为胡安 · 费尔南德斯脊的海底山脉的俯冲作用。
Upward-fining channels may occur in a wide range of environments from submarine canyon to alluvial fan.
向上变细的水道可以出现在好多种环境中，从海底峡谷到冲积扇。
The F is used for short range anti-submarine purpose around the carrier and depends on its own AQS-13F suspensory sonar to detect the submarine.
型则用于航母周围的短距反潜，主要依赖其AQS-13F悬吊声纳探测雷达。
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