https://static01.nyt.com/images/2022/04/30/world/CN-30VIRUS-CHINA-POLITICS-01-copy/30VIRUS-CHINA-POLITICS-01-mediumThreeByTwo440.jpg简报：习近平为何避谈上海封城；美国最高法院堕胎权意见草案遭泄露意味着什么