英语翻译我们生产沙子的时候都用筛网的,只要你规定要5cm的,筛出来的产品就会在4～5cm区间范围.我之所以给你寄一些比较

We always use a filter when collecting sand, if you specify 5cm, the filtered sand product will be around 4 to 5 cm. The reason I sent you coarser sand is for you to have a better view of the product.
As for payment method, I agree to your first proposal, but we need a 50% deposit first. The cost of the product is really low, if 2 payments are made, the bank will charge us twice for service fees.