When you summarize, you condense an extended idea or argument into a sentence or more in your own words.
总结的时候，用自己的话把拓展了的观念或论据简缩成一句或几句话。
《柯林斯英汉双解大词典》
2
If some reefs are destroyed by storms, starfish populations that inhabited those reefs would have to condense and concentrate on the reefs that are left.
如果一些珊瑚礁被风暴摧毁了，居住在那些珊瑚礁上的海星种群将不得不集中在剩下的珊瑚礁上。
3
The arch-fiend whispered him to condense into a small compass.