经过两次车主爽约，我对返程坐顺风车已经不抱希望。情急之下，只能赶紧打开铁路购票App。运气还算不错，返程当天的二等座只剩3张，我手忙脚乱地选座、填信息、提交订单，付款成功的那一刻，悬着的心才落地。还好没被顺风车耽误返程，不然真不知道该怎么赶回去上班。
这种效果在物理学上被称为「朗伯余弦定律」（Lambert’s Cosine Law），其核心特征就是无论从哪个角度观察，屏幕的亮度看起来都是一样的。
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The slightest bitThe answer is A tad.
"Every box has a surprise," Machin said as she unwrapped perhaps the most bizarre item here, thought to be from the 19th Century: a set of lower gold dentures found at St Mary's Old Church in Stoke Mandeville.
The Daily Show's Desi Lydic also watched the U.S. president's one hour and 47-minute speech so you don't have to, unpacking the address on Wednesday night.