彼女、問題の中心は信頼関係にあると言った

N5 彼女 kanojo she N5 問題 mondai problem, question N3 中心 chuushin center, core, main point N3 信頼 shinrai trust, reliance, confidence N4 関係 kankei relation(ship), connection

N3 係 kei / kaka.ru, kakari, -gakari, kaka.waru person in charge, connection, duty N4 言 gen, gon / i.u, koto say, word, dire

N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action N5 〜と to Indicates company, quotation, natural condition, complete list, or direct connection between elements N5 〜の no Indicates possession, relation between nouns, nominal explanation, or turns a verb into a noun phrase N5 〜は wa Marks the topic of the sentence, indicates what the sentence is about, can contrast with another element, organizes main information