What does 主体 mean?
主体 is a Japanese noun meaning “subject, main constituent” in English. It can also be translated as “subject” depending on context. It is written as 主体 in kanji, しゅたい in hiragana, and shutai in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
主体・客体さえ訳せればあとはそこまで難しくないです。
If you can translate the subject and object then after that it isn't so difficult.