之前讲过put down your foot和put your foot in your mouth，刚刚说了个get back on one’s feet，再补充一个think on one's feet。think on one’s feet可以理解为”边走边想，现场发挥，急中生智，随机应变”。要充分准备，台下十年功，也要锻炼自己play it by ear, wing it, make up as you go along, think on your feet[举杠铃]