s***t
发帖数: 197 | 1 back up (1. no object): move backward; move in reverse.
"You missed the lines in the parking space. You'll have to back up
and try again."
"The people waiting in line are too close to the door. We won't be
able to open it unless they back up."
back up (2. separable): drive a vehicle backwards (in reverse).
"You're too close! Back your car up so I can open the garage door."
back up (3. separable): confirm a story, facts, or information.
"If you don't believe me, ta |
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