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to combine something with another substance or element
混ぜる, 融合する
to make something a permanent and necessary part of a larger system or structure
組み込む, 内蔵する
to include or involve someone in a particular activity, decision, or plan
含める, 参加させる
to be involved in or conduct activities related to a particular kind of business, commodity, or trade
取り扱う, 関与する
to enthusiastically start doing something without thinking about it
飛び込む（とびこむ）, 積極的に取り組む（せっきょくてきにとりくむ）
to engage or involve someone in a particular activity, situation, or conversation
引き込む, 巻き込む
to participate in or become involved in a particular activity, conversation, etc.
参加する (さんかする), 従事する (じゅうじする)
to join a group or organization
参加する, 加わる
to be socially fit for or belong within a particular group or environment
馴染む（なじむ）, 溶け込む（とけこむ）
to gently mix one ingredient into another by lifting and turning the mixture with a spatula or spoon
折り込む (おりこむ), まぜる (混ぜる)
to participate in an ongoing activity or opportunity when others are already involved
参加する, 加わる
to engage in an activity or interest as a hobby or pastime
興味を持つ, 趣味として取り入れる
to take part in an activity or event that others are already engaged in
参加する, 加わる
to get involved in something without delay
飛び込む, 参加する
to get oneself or someone into trouble or difficulty
巻き込む, トラブルに巻き込む
to study a particular subject as one's main field of study at a college or university
専攻する（せんこうする）, メジャーをする（めじゃーをする）
to choose to participate in something, typically by actively indicating one's willingness or consent to do so
参加することを選択する, 同意する
to be deeply surrounded by a significant amount of tradition or history
伝統に浸る, 伝統に染まる
to get involved in an argument, discussion, or activity and share one's opinions
意見を言う, 参加する
