hum and haw 支支吾吾；吞吞吐吐；踌躇再三；迟疑

【例句】
Members hum and haw a half-day before that I heard was one of the arms into.
同事支支吾吾了半天才说，听说我是一头扎进了总经理怀里。

I hum and haw a long time, I can not find any reason, but you have set in my mind can not erase the footprints.
我支支吾吾半天，他找不出任何理由，但是，你却在我心中立下了不可抹去的脚印。