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sign up ['saɪn'ʌp]
gen. 报名; 注册; 签约参加工作; 签约承担义务 (for)
interntl.trade. 签约雇佣; 使签约承担义务
tech. (合同)
sign up: 5 phrases in 4 subjects
China1
Economy2
General1
Sports1