The <em>bumbling</em> of our salesman cost us the account.
推销员所犯的错误使我们失去了那位客户。
"The old lady kept <em>bumbling</em> on about something, but nobody could understand her."
"老太太结结巴巴地说个不停,可谁也不明白她说些什么。"
What are you <em>bumbling</em> (on) about?
你颠三倒四地说些什麽呀?