请英语高手帮我把这段英语翻译成汉语

Before placing a firm order , we should be glad if you would send us your . products on fifteen day's approval , any of the items unsold at the end of the period and which we decide not to keep as stock , would be returned at our expense , I'm looking forward to hearing from you soon

帮忙翻译..时间紧迫

在下正式订单前，我们希望您先发些货，且此批15日内可退货退款。15日内没能售出且不留作存货的剩余产品，退货费用我们负担。期待您的回复。