up 表示跟上keep，不落人之后，对…消息灵通，保持接触。
用法：Many people were holding down three jobs just to keep up with the Joneses。
许多人同时做3份工作只不过是为了和别人攀比。
Penny tended to work through her lunch hour in an effort to keep up with her work。
为了把活儿干完，彭妮常常午饭时间也要工作。
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