safe and sound：安然无恙
一、短语记忆
这个短语的关键就是sound这个单词，我们以前学过它的名词含义“声音”，动词含义“听起来”。其实这个单词还有一个形容词含义：
柯林斯：If a structure, part of someone's body, or someone's mind is sound, it is in good condition or healthy. 健康的; 状况良好的
When we bought the house, it was structurally sound.
当我们买下这房子时，其结构完好无损。
知道了sound的形容词含义，那么safe and sound这个短语的含义就很简单了。
二、例句
1.直到那位母亲确信她的儿子已安然无恙地到家，她才松了一口气。(Not until…)
Not until the mother made sure that her son had got home, safe and sound, did she feel relieved.
2.听到两位宇航员安然无恙返回地球的消息，人们欣喜若狂。(wild)
Hearing the news that the astronauts returned to the earth safe and sound, people were wild with joy.
3.这些孩子们平安地从这个短途旅行中回来。
The kids returned from the excursion safe and sound.
4.电影：火星救援 The Martian
We still have a chance to bring five astronauts home safe and sound.
我们仍然有机会让五名宇航员都安全回家。