External factors: life region climate, dry, cold working environment air is dust, chemical gas pollution, alcohol and tobacco, spicy food stimulation, are easy to long-term chronic pharyngitis.
外界因素：生活地域气候寒冷、干燥，工作环境空气被粉尘、化学气体污染，烟酒、辛辣饮食长期刺激，都易得慢性咽炎。
"We're motivated to seek out this kind of stimulation to explore new possibilities, to find new sources of food, better places to live and good Allies," McAndrew said.
我们被此种需求驱使探索新的可能，寻找新的食物来源、更好的居住地和好的合作伙伴。
This behavior suggested that the junk-food–eating rats needed more brain stimulation to feel good compared with rats on a normal diet.
这一行为表明，与食用正常食物的老鼠们相比，这些老鼠需要更多的脑部刺激以获得愉悦感。
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