Purpose: Osteoarthritis(OA) is one common joint disease, clinical manifestation pain with joint, swelling, stiff and activitylimit to into the characteristic .
She and her husband already limit their children to one extracurricular activity at a time to keep them from exhaustion.
她和她的丈夫已经开始限制孩子一次只能参加一项课外活动，以免他们精疲力尽。
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The Earth does not have an inexhaustible supply of resources, so every effort should be made to conserve resources and limit the impact of human activity on the planet.