‘Next-level urgency’: EU leaders spring into action as reality of US pivot to Russia hits ‘A European/ˌjʊərəˈpiːən/-Russian/ˈ...

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question Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to ta...

Pressure to the surface to a stream notation \(\varpi\): -> r ///////p439 (22) \(\sigma\): -> \(\omega\) \(c\): -> \...

wave patterns 📄P411, Sec 12.4 For a point source \(P\), the characteristics carrying disturbances pass through \(P\) and we...

1-dimensional Gaussian integral \[ \begin{gathered} \int_{-\infty}^{\infty} e^{-x^2} d x=\sqrt{\pi} \\ \int_{-\infty}^{\infty...

原想写一些剖析自我的文字，却不知如何下笔，也罢，就写写最近的杂绪吧。 早春，院子里的不知名的树依然光秃着树干，纹丝不动地点缀着视野里的红墙，肃杀而冷淡。又是一个冬去了，除却偶或光临的故乡的喜鹊，在小院凌乱的大戏台，唱着故园情、天涯愁。素常，小院是安静...

回乡偶书二首贺知章少小离家老大回，乡音无改鬓毛衰。儿童相见不相识，笑问客从何处来。离别家乡岁月多，近来人事半销磨。唯有门前镜湖水，春风不改旧时波。清心溯风止