赋予一定价值给卫星最后自我牺牲的火箭爆炸，也许能解决上诉问题。 即发射卫星需缴纳定金，只有当这颗卫星最终安全处理后，定金才可以返还。
A deposit payable on launch, to be refunded when asatellite is disposed of safely, could deal with this by giving value to thatlast, self-sacrificial rocket blast.
定金需在报名后5个工作日之内缴纳(展位费的20%)。
Down payment should be paid within 5 working days after application (20% of booth price).
合同订立后，乙方不能交付本合同全款的，须向甲方缴纳不低于本合同交易金额20%的定金。
In the case that Party B cannot pay in full , he should pay advance deposit to Party A as long as the contract has been concluded, which is not less than 20% of trading amount.
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