求翻译：本合同（含附件）一式两份（鉴证时需一式三份，其中鉴证机构留存一份），双方签字后，甲方必须将其中一份交给乙方持有，均具有同等法律效力。是什么意思？

This contract (including attachments) in duplicate (Identification is required in triplicate, which retained a forensic institution), signed by both parties, Party A to Party B which must be held, shall have the same legal effect .

THIS CONTRACT (including annex) in two copies (authentication required when 3 copies of a forensic agencies, of which retained a), signed by both parties, a party must serve one of the assigned to Party B and are having the same legal effect.

This contract (including appendix) type two (when verification needs triplicate copy, in which verification organization preserves one), after both sides sign, the party of the first part must give one the second party to have, has the same level legal effect.

This contract (including attachments) in duplicate (three copies of the verification required, forensic agencies retain a copy of them), the two sides signed, party a must give one to a party, shall have the same legal effect.

This contract (including attachments) in duplicate (three copies of the verification required, forensic agencies retain a copy of them), the two sides signed, party a must give one to a party, shall have the same legal effect.