徒步区
(Tw) car-free zone; pedestrian zone
不吐不快
to have to pour out what's on one's mind (idiom)
凹凸不平
uneven (surface); bumpy (road)
狗嘴里吐不出象牙
no ivory comes from the mouth of a dog (idiom); no good words are to be expected from a scoundrel
黄土不露天
a slogan used in reference to a project to improve greenery in some parts of Northern China