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海洋生態学
marine ecologynoun
の
possession, attribution, nominalizer, or nominal linkergrammar
研究
research; study; investigationnoun, suru verb
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
潜水
diving; submerging; going underwaternoun, suru verb
調査
investigation; examination; inquiry; surveynoun, suru verb
が
subject markergrammar
欠かせない。
indispensable; essential; vital; crucialexpression, i-adjective