ジャックは群集の中に見えなくなった。

jack; knave; (electrical) jack; takeover; seizure; hijack

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

group (of living things); crowd; community

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

to have an audience; to meet; to see; to face (an enemy); to confront; to serve (esp. as one's wife)

to become; to get; to grow; to be; to reach; to attain; to result in; to prove to be; to consist of; to be composed of; to succeed; to be complete; to change into; to be exchanged for; to play a role; to be promoted; to do ...