on one's feet   (TTS發音)

1. standing or walking站立或步行

    Before the teacher finished asking the question， George was on his feet，ready to answer it . 老師的問題還沒問完，喬治就已經站起來準備回答。

    How do you keep on your feet so long？你怎麼堅持站了這麼長時間？

2. recovering恢復（身體）

    Jack is back on his feet after a long illness. 傑克病了好長時間，現在恢復健康了。