在美国逆转对中产阶级安全感的长期侵蚀不能一蹴而就。
Reversing the long erosion of middle-class security in this country won't be easy.
胃内食物的排空时间大概在4 ~ 6小时之间，排空之后，胃会继续分泌胃酸，如果没有食物中和，胃酸会长期侵蚀胃黏膜。
Gastric emptying time of food is about 4 ~ 6 hours, after emptying, the stomach will continue to secrete gastric acid, if there is no food, stomach acid will be long-term erosion of gastric mucosa.
冰川可能形成于长期寒冷的地区，而这些缓慢移动的冰块切割了山谷，带走了大量被侵蚀的岩石碎片。
Glaciers may form in permanently cold areas, and these slowly moving masses of ice cut out valleys, carrying with them huge quantities of eroded rock debris.
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