「在過去九個月中，沒有非法移民被允許進入美國」
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00620-x。关于这个话题，爱思助手下载最新版本提供了深入分析
Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.。同城约会是该领域的重要参考
Discard old data: evict what's already buffered to make room