上週，數百萬阿麗亞娜·格蘭德（Ariana Grande）的粉絲參加了她的音樂會，這些音樂會不是在傳統場地舉行，而是在遊戲《堡壘之夜》（Fortnite）中舉行。這些活動配有音樂和3D畫面，是硅谷最受歡迎的新流行語的一個例子：元宇宙。
上週，數百萬阿麗亞娜·格蘭德（Ariana Grande）的粉絲參加了她的音樂會，這些音樂會不是在傳統場地舉行，而是在遊戲《堡壘之夜》（Fortnite）中舉行。這些活動配有音樂和3D畫面，是硅谷最受歡迎的新流行語的一個例子：元宇宙。
Among all the Beijing place names of the form “X-daokou,” Wu Daokou—often jokingly called the “Center of the Universe”—is by far the most famous. Looking at the map, we can find three places called Si Daokou, one Wu Daokou, and two Liu Daokou in Beijing today. In this piece, we will examine how these “daokou” came to be.
AA and AAA batteries differ in size, yet both have a voltage of 1.5 V. Nickel–metal hydride (NiMH) batteries are rechargeable and come in the same sizes as AA and AAA, but their voltage is 1.2 V. Mobile phone lithium batteries, on the other hand, are often rated at 3.7 V. You may have noticed these seemingly odd numbers before. Have you ever wondered why these different types of batteries all have such fixed voltage values? Today, let’s get to the root of the question.