Requests for a change can be direct or indirect, externally or internally initiated, and can be optional or legally/contractually mandated.
变更请求可以直接或间接、内部或外部提出，可以是可选择的，也可以是法律或合同强制要求的。
Indirect request is a speech act in which the requests are performed in an indirect manner.
间接请求是间接地实施请求的言语行为。
Indirect request is a speech act in which the requests are performed in an indirect manner.
间接请求是间接地实施请求的言语行为。
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