| 词组 | keep back |
| 释义 | keep backv. phr.To refrain or be restrained from entering; remain back. （使）不靠近；留在后面。◆ The police had a hard time keeping back the crowd when the astronauts came to town after walking on the moon.当宇航员在月球上行走后来到城里时，警察们费了好大的劲才挡住了人群。 |
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