She's been on her feet an hour.

这句话的意思是：她已经站了一个小时了。

1. 逐部分理解

• She's = She has（这里是现在完成时，不是 She is）
• been /bɪn/ = be 的过去分词
• on her feet = 站着；双脚站立着
• an hour = 一个小时

完整结构是：

She has been on her feet for an hour.

她已经站了一个小时了。

原句省略了介词 for，在口语中很常见。

2. 重点短语：on one's feet

on one's feet /ɑːn wʌnz fiːt/ 短语：站着；站立；也可以引申为恢复健康、恢复正常状态。

例句：

- I've been on my feet all day. 我一整天都站着。

- My feet hurt from being on my feet so long. 因为站了太久，我的脚都疼了。

- She's back on her feet after the illness. 她生病后已经恢复健康了。

3. She's been 是什么意思？

这里的 She's been 是 She has been 的缩写。

现在完成时强调：从过去某个时间开始，一直持续到现在。

例如：

- She's been here for two hours. 她已经在这里待了两个小时了。

- She's been working all day. 她已经工作一整天了。

- She's been on her feet an hour. 她已经站了一个小时了。

听力重点： She's been on her feet 连读时，been on 容易连在一起，听起来不像一个个独立的单词。要把整个短语作为一个语音单位来熟悉。