unity and cooperation are our most potent weapon. The Bill & Melinda Gates Foundation was quick to join the global response to the COVID-19 outbreak and has played an activ...
新研究：空闲时间太多不一定更幸福 New study reveals how much free time you may need to be happier 一年到头忙得团团转的人总是想，要是有一天能闲下来就好了。然而终日无所事事的...
Vox公司解释道，这一惯例源自20世纪早期，当时虫胶制作的黑胶唱片（粗纹唱片）刚刚在市场上出现。这些唱片的转速各有不同，但是每分钟78圈的转速很快便成了业内标准。最流行的唱片大小...
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