brief的副詞形式是什么

　　The problem had been alluded to briefly in earlier discussions.

　　這個問題在以往的討論中已經間接提及。

　　He glanced briefly towards her but there was no sign of recognition.

　　他瞥了她一眼，但似乎沒認出她來。

　　She looked up briefly then returned to her sewing.

　　她抬頭看了一眼，又接著做她的針線活兒。

　　He glanced briefly down the list of names.

　　他草草看了一遍名單。

　　There are four basic alternatives; they are described briefly below.

　　有4個基本的選項，簡述如下。