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Explanation: "To sail boats in/on the ocean." Nausi plein en tôi okeanô.
The word NAUS is the form used for the plural dative (a special form of nouns and pronouns), used for instruments -- rather like, "in boats" or "by means of boats".
PLEIN is the infinitive of the verb PLEO, "I sail".
EN is the preposition meaning "in" or "on". EN occurs with noun or pronoun objects in the dative case only (a special form of the noun or pronoun).
TÔI OKEANÔI means "the ocean", but it is in the dative form, as required by the prepostion EN. The nominative form (used for sentence subjects) would be HO OKEANOS.
FINAL NOTE >>>>> Ancient Greek word order was very flexible. Occasionally a specific form may have alternative spellings, as in the case of NAUSI(N), depending on the phonetic and syntactic environment. The whole sentence could appear as any of the following: