副詞 in brief:

1. in a concise manner; in a few words
   同義詞：concisely, briefly, shortly, in short

1. In brief, mammals are warm-blooded, lung-breathing, hairy vertebrates.
   簡言之，哺乳動物是溫血、肺呼吸和多毛的脊椎動物。
2. I treated the subject in brief outline.
   我簡單地概述了那個問題。
3. In brief, your work is bad.
   總之，你做得不好。
4. In brief, Tom is a lazy boy.
   簡而言之，湯姆是個懶孩子。