オレンジはたくさんのビタミンＣを含んでいる。

orange

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

a lot; lots; plenty; many; a large number; much; a great deal; a good deal; enough; sufficient; enough; too many; too much

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

vitamin

C; c

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to contain; to comprise; to have; to hold; to include; to embrace; to hold in the mouth; to bear in mind; to understand; to harbor (grudge, etc.); to harbour; to express (emotion, etc.); to imply