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An ocean gutter is an ocean trench.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
鰻がフィリピン海溝の近くで産卵することは、フィリピン人に知られているのでしょうか。
I wonder if Filipinos know that the spawning place for eels is close to the Philippine Trench.
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