sales on approval

例句：

1. 1. The company's policy requires that all sales be approved before they can proceed.
   该公司的政策要求所有销售在开始之前都必须得到批准。
2. 2. The sales team needs to have the necessary approvals in place before they can begin selling.
   销售团队在开始销售之前需要获得必要的批准。
3. 3.The product was not approved for sale until it passed rigorous testing.
   该产品在通过严格测试后才得以销售。