BRUSSELS, Aug. 18 (Xinhua) -- European leaders will hold a preparatory meeting with Ukrainian President Volodymyr Zelensky in Washington on Monday, ahead of White House talks later the same day with U ...

The report also noted that current revenues from the tariffs do not even cover the interest on the U.S. debt, let alone ...

在一项新发表于《自然·通讯》杂志的研究中，一组研究人员发现，一种淡水螺类——福寿螺（Pomacea canaliculata）的眼睛能实现完全再生。更关键的是，这项研究还展示了福寿螺的眼睛与人类眼睛在解剖结构和基因层面的多处共同之处。 器官再生 ...