书也可以人工变黄(通过放在太阳下晒，放入烤箱低温非常小心地烘烤)来做成极好的仿古董墙装饰。
Book pages artificially yellowed (by leaving them in the sun, or very carefully baking them in an oven at a low temperature) make terrific faux-antique wall decoration.
香烟中的尼古丁不仅会使你的牙齿以及你家的墙变黄，而且还会使你的手指和指甲变色。
The nicotine in cigarette smoke can not only make your teeth (and the walls of your home) brown, but it's also notorious for staining fingers and nails as well.
我开线的那天下着暴雨，等路线变干之后我就迫不及待的上墙了！
I bolted on a miserable rainy day, and began trying it as soon as it was dry!
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