It is not an automatic, predetermined response to environmental stimuli.

它不是对环境刺激的自动、预定的反应。

Whether your bedroom is too loud, too hot, too simply uncomfortable, there are simple measures that you can take to prevent environmental stimuli from interrupting your regular sleep schedule.

无论是卧室太吵太热，还是单纯地让人不舒服，我们都可以试试这几个简单的方法，避免环境刺激因素中断规律的睡眠安排。

Because it is ultimately some combination of environmental stimuli, perhaps the sulfide producing bacteria, mixed with genetic predisposition because patients with a family history of ulcerative colitis are more likely to develop the disease themselves.

因为从根本上说，溃疡性结肠炎是多种环境刺激因素共同作用的结果，如产硫菌，附加遗传易感性的共同作用，这是因为有溃疡性结肠炎家族史的患者较正常人更易发病。