The Centers for Disease Control and Prevention recommends taking a break from your screen every half an hour to prevent repetitive motion disorder and eyestrain.

美国疾病控制与预防中心建议，每看半个小时电脑就要休息一下，预防反复的运动障碍和视疲劳。

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Dysthymic disorder, or dysthymia, is characterized by long-term (2 years or longer) symptoms that may not be severe enough to disable a person but can prevent normal functioning or feeling well.

心境恶劣障碍，也叫做恶劣心境，以长期(两年或更长)但是较轻的症状为特色。它并不一定使个人致残，但是能使个人正常机能受损或不能感到心情舒服。

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Many patients with bipolar disorder require long-term treatment to prevent recurrence.

许多双相情感障碍患者需要接受长期治疗以避免复发。

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But whatever the reason, the light touch, by failing to prevent disorder, has alienated people.

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Officers said notices issued by Sussex Police under the Public Order Act were to prevent disorder, damage, disruption or intimidation.

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"It is very positive that... steps are being taken to help prevent future disorder on the scale seen in August this year, " he said.

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