求翻译：合同余款： 50 %的合同金额于送货安装后七日内支付，逾期则每日按未付款部分的5‰收取滞纳金；在货款未付清前，货物所有权归卖方所有。是什么意思？

The balance of the contract: 50% of the contract amount is paid within seven days after the delivery and installation, overdue daily at 5 ‰ of the unpaid portion of the charge late fees; before the loan is not paid, title to the goods in the seller.

Under contract: 50 per cent of the contract amount to install 7 days after delivery, and payment is overdue payments daily press is not part of the charged 5 per 1,000 in late fees; payment has not been paid, the ownership of the goods to the seller.

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The balance of the contract: 50% of the contract amount on delivery payments within the 7th after installation, overdue by 5 per thousand of the unpaid part of the day charge a late fee; before the purchase price is not paid, all property of the seller of the goods.

正在翻译，请等待...