In his first year back in office, Trump has cracked down on immigration by narrowing legal pathways for migrants, restricting visa processing for nationals from 75 countries, and enacting sweeping deportation campaigns in U.S. cities.
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数据显示，在去年4月中国实施出口管制后的八个月内，中国对美出口的钇类产品仅17吨，而此前八个月相关出口量为333吨，降幅极为显著。
举个例子，比如拍一张有三瓶矿泉水的照片，白天和晚上光线不同，整张图片的色温、亮度都变了，模型可能就不认识了。