| 短语 | sneak up (on sb/sth) | 
| 释义 | ˌsneak ˈup (on sb/sth)to move towards sb very quietly so that they do not see or hear you until you reach them偷偷走近He sneaked up on his sister and shouted ‘Boo!’.他偷偷溜到妹妹身边,然后大喊一声“嘿!” | 
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