种子和果实的扩散是维持生态系统结构与功能的关键过程。对大部分植物而言，种子和果实的扩散是其生命周期中唯一能够实现个体迁移的阶段。与动物传播相比，依靠风力传播的植物更容易受到气候变化的影响，因为动物活动会将种子或果实运送到更适宜动植物生活的地方（定向传播）。早渐新世是“冷室气候”的起点，欧亚大陆植被从晚始新世的亚热带常绿阔叶林转变为温带落叶混交林。这一时期植物种子和果实的主要扩散方式是什么？欧亚大陆 ...

PRAGUE, July 16 (Xinhua) -- The United States beat China 122-57 in the round of 16 at the 2025 FIBA U19 Women's World Cup on Wednesday, as the tournament continues in Brno, Czech Republic.

U.S. President Donald Trump announced Saturday that his administration would impose 30 percent tariffs on EU and Mexican exports, arguing that bilateral trade had long been unbalanced and lacked ...