He waltzed across to Helen and sat down beside her.

轻松自如地走到海伦身边坐下。

His bad English inhibits him from speaking freely.

英语学得不好, 这使不能表达自如。

The gymnast performed on the balance beam with an easy grace.

体操运动员在平衡木上表演得优美自如。

He sat in a relaxed pose.

轻松自如地坐着。

He was gradually getting more supple.

的身体渐可以活动自如。

There are quite a number of asymptomatically infected in the population, and they may discharge hepatitis A virus at certain times and under certain conditions.

无症状感者在人群中为数不少，在一定时期和条件下也可排出甲肝病毒，但此时带毒者常活动自如，不易管理，因而作为传有重要意义。