Methods: 22 patients with chronic periodontitis were enrolled in a 9-month maintenance care program after non-surgical periodontal therapy.
方法：对牙周非手术基础治疗后进入维护治疗期的22名慢性牙周炎患者进行9个月的纵向观察。
If, by definition, health care means "the maintenance of good health," then technology has failed miserably to produce any measurable improvement in the overall state of health of mankind.
如果按照定义，健康保健是指“维护健康状况的良好”，那么技术在提升人类整体健康状况上已经失败。
Also, it's normally up to the landlord to take care of major maintenance issues for the home. You're probably not responsible for tiring tasks like mowing the lawn or the shoveling the snow.
而且，那些日常的清理和维护通常也都有房东来做：你可以把诸如修剪草坪和扫除积雪的时间省下来做其他更有价值的事情。
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