~を中心に
Center an activity or group around something
You’ll be able to say that an activity, group, or discussion is organized mainly around a central person, place, or topic.

たき火を中心に、みんなで椅子を並べて座りました。
takibi o chuushin ni, minna de isu o narabete suwarimashita.
What do you think this sentence means?
With the campfire in the center, we lined up chairs together and sat down.
Centered around a key element
~を中心に means “centered around” or “mainly focused on.” It identifies the main person, group, place, or topic around which something is organized.
今日の授業は会話を中心に進めます。
kyou no jugyou wa kaiwa o chuushin ni susumemasu.
Today’s class will focus mainly on conversation.
九州を中心に、雨が強く降っています。
kyuushuu o chuushin ni, ame ga tsuyoku futte imasu.
It is raining hard, mainly in Kyushu.
Put the main focus first
Attach を中心に to a noun. Use ~を中心とした before a noun, as in 学生を中心としたグループ (“a group centered around students”).
駅を中心に、新しい店が増えています。
eki o chuushin ni, atarashii mise ga fuete imasu.
New shops are increasing around the station area.
この病気は、小さい子どもを中心に広がっている。
kono byouki wa, chiisai kodomo o chuushin ni hirogatte iru.
This illness is spreading mainly among young children.
今の私の生活は、仕事を中心に回っている。
ima no watashi no seikatsu wa, shigoto o chuushin ni mawatte iru.
My life right now revolves around work.
今度のテストでは、漢字を中心に問題が出るそうです。
kondo no tesuto de wa, kanji o chuushin ni mondai ga deru sou desu.
I hear the questions on the next test will focus mainly on kanji.
7 more examples in the grammar path — free for a limited time.