求翻译：现合同约定装运货物的时限已过，你公司却一直未有通知HARMONY GROUP LIMITED确定具体的货物装运日期。为维护合法权益，实现合同目的，HARMONY GROUP LIMITED现委托本所律师发函催告你公司，请你公司收到本函之日起三日内确定货物的具体装运日期并书面（或邮件）告知HARMONY GROUP LIMITED，同时请你公司做好收货和付款的准备，以便顺利履行合同的各项内容。是什么意思？

Contract shipment time frame has passed, your company has not informed the HARMONY GROUP LIMITED to identify specific shipment date. To safeguard the legitimate rights and interests, the purpose of the contract, lawyer sent a letter to HARMONY GROUP LIMITED is now consigned to the demand of your com