求翻译：甲乙双方必须保证在4个月内完成机器的退运。如果因为机器在4个月内没有退运或国家政策变化，及非丙方原因造成的税款保证金无法退还，此保证金由甲方来承担。激光发生器在中国境内期间，丙方拥有其垫付金额等值的货物所有权。是什么意思？

Both parties must ensure that returned four months to complete the machine. Because the machine did not returned in four months or national policy changes can not be returned, and causes of non-Party C tax margin, this margin is borne by the Party. The laser generator in China during the period, Par

Both parties must ensure that the completed within 4 months the machine back. If you because the machine within a 4-month period without any luck or national policy changes, and the non-C Party causes the Tax Deposit, This deposit is not refundable by the party. laser generator in the territory of C

Armor second grade both sides must guarantee completes the machine in 4 months shipping back.Because if the machine has not shipped back or the national policy change in 4 months, and the non-third side reason creates the tax money earnest money is unable to return, this earnest money undertakes by

Both parties must guarantee complete machines return within 4 months. If the machine does not return within 4 months or changes in national policy, and non-party c taxes as a result of security deposit cannot be refunded, this margin borne by the customer. During the laser generator in China, party

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