In 1835, Charles Darwin gazed at coral reefs in the Pacific Ocean, and these intricate marine structures sparked his thoughts on the evolution of life. Nearly two centuries later, Darwin's inquiry abo ...

文字稿 Hi everyone, Tom here for BBC Learning English. Today, I’m going to show you how to use the future continuous. We use the future continuous to describe actions in progress at a future point in ...

CAIRO, Sept. 15 (Xinhua) -- The fifth annual Bayt Al-Hekma Chinese language and talent competition concluded here Sunday night, with its wide participation and outstanding performances showcasing the ...

IMO’s original mandate was principally concerned with maritime safety. However, as the custodian of the 1954 International ...

FREETOWN, Sept. 13 (Xinhua) -- The China Railway Seventh Group (CRSG) officially launched its Chinese culture learning program on Saturday in Freetown, the capital of Sierra Leone.

2025 年是世界上第一列旅客列车投入使用 200 周年。1825 年，世界上第一列旅客列车以每小时 24 公里的速度行驶在英格兰的斯托克顿和达灵顿之间。本期节目将介绍为了庆祝这个里程碑英国所开展的活动，以及火车爱好者汤姆·切什尔最喜欢的英国慢车旅行路线，带你感受铁路旅行的独特魅力。

Eight years is just the warm-up. Our anniversary theme, Trot On to Infinity, reflects our belief that crypto is a marathon with no finish line. Together, may we continue running, through every ...

Discover the latest and most groundbreaking inventions and technologies reshaping our world! In this video, we dive deep into a lineup of extraordinary innovations—from advanced robotics and futuristi ...

整理/余冰玥 ...

Being part of Peking University means having access to a wide range of retail stores and services on campus. Here you can find information on campus services you may need, including bookstores, ...

常年被商赛选手们评价 “五星难度” “不适合0基础商赛选手”的 哥大全球模拟企业家大赛（Model Entrepreneur® Competition，简称MEC）是由哥伦比亚大学商学院官方发起的、拥有11年历史的全球性高中生商业模拟赛事。

摘要：从芳环上的亲电取代反应出发，对第38届中国化学奥林匹克初赛中的有机化学第9题进行了深入的解析，旨在探讨芳环亲电取代反应的核心机理，有机化学的学习策略以及学科思维方式，为读者备考之后的比赛和研究试题提供参考。