be confined to; be limited to

1. 這次會議上的討論只限于議程上的項目。
   Discussion at the meeting was restricted to the agenda.
2. 當你不再僅僅限于文字和靜止圖片時，網上生活會豐富多彩得多。
   Life on-line can be a much richer experience when you aren't restricted to just written words and still pictures.
3. 短暫的僅限于一個插曲持續(xù)的時間；短暫的
   Limited to the duration of an episode; temporary.
4. 化學合成用簡單無機化合物的化學氧化所產生的能量將二氧化碳和水合成碳水化合物。這種化學合成形式只限于某些細菌和真菌
   Synthesis of carbohydrate from carbon dioxide and water using energy obtained from the chemical oxidation of simple inorganic compounds. This form of synthesis is limited to certain bacteria and fungi.

于的英語翻譯：