double character of commodity

例句：

1. 1.The price of the product doubles every year.
   该产品的价格每年翻倍。
2. 2. She doubled her efforts to finish the project on time.
   她加倍努力以按时完成这个项目。
3. 3. They double-checked all the details before sending the proposal.
   在提交提案之前，他们仔细检查了所有细节。