As far as I know, in most cases, Amazon recommends using English when opening a case. This is because Amazon, as a global e-commerce platform, uses English as its main working language. Using English can better communicate and exchange with customer service staff to ensure that the problem is accurately expressed and understood. In addition, using English can also get faster and more effective support and solutions. However, if you are in a specific region of Amazon's international site, you may be able to use the local official language to open a case. For example, you may use Chinese to communicate on the Chinese site. It should be noted that regarding the specific language requirements for opening a case, it is best to check and confirm in Amazon's help documents or related guides to ensure that your problem is resolved accurately and in a timely manner.