According to the situation at that time, direct speech can use various tenses such as present tense, past tense and future tense, and indirect speech can use past tense.
News reports use the simple past tense.
Live and real-time reports use the simple present tense.
Describe the method, process and steps in the simple present tense.
The simple present tense is used to introduce the examination method and process, and the simple past tense is used for the process and conclusion.