How to say topic in Japanese

Example Sentences

トピずれTOPIzureですdesu。すみませんsumimasen。: This is off-topic. Sorry.
「いやーiyaa、今日kyou もmo 暑いatsui ねne」「またmata 当たり障りのないatarisawarinonai 話を振ってhanashiwofutte きたkita わねwane」: "Well, it's hot again today, isn't it?" "That's one more time you've started with a bland topic."
今日kyou のno トピックTOPIKKU はha「北朝鮮kitachousen によるniyoru 日本人nipponjin 拉致rachi 問題mondai」ですdesu。: Today's topic is "the problem of Japanese people abducted by North Korea".
彼kare はha 話題wadai をwo 変えたkaeta。: He changed the topic of conversation.
彼kare はha そのsono 話題wadai にni よくyoku 通じているtsuujiteiru。: He is familiar with the topic.

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