限于…之內 limit sb/sth to sth such as a place or subject
confine oneself/sb/sth to sth
Illness confined him to his room.
他因病呆在屋里。
He has confined himself to the study of modern languages.
他只學習現代語言。
Please confine your remarks to the subject under discussion.
請把你的話題限于我們所討論的題目范圍之內。
The edition is confined to 5000 copies.
這一版書限出5000冊。
Our knowledge about agriculture has so far been exclusively confined to books.
我們對農業的知識至今只限于書本上所說的。
For the time being the call-up will be confined to men under the age of twenty-five.
眼下征召令將限于二十五歲以下的男子。