教授喝醉后开始语无伦次地东拉西扯。
The professor started to ___bumble incoherently after drinking too much.
他在黑暗的房间里笨拙地摸索着找电灯开关。
He ___bumbled around the dark room, trying to find the light switch.
他在黑暗中笨拙地摸索着开关。
He ___bumbles around in the dark, clumsily searching for the light switch.
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