move or progress at the same rate as someone or something else
跟上
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often they had to pause to allow him to keep up .他们时常不得不停一停,等他跟上来。
meet a commitment to pay or do something regularly
承诺按期付款或做(某事)
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if you do not keep up with the payments, the loan company can make you sell your home .如果你不按期付款,贷款银行就会让你卖掉房子。