按照孩子的年龄，性格，兴趣和思考能力来安排一些适量的事情及挑选活动是个关键点。
The key is to schedule things in moderation and choose activities with a child's age, temperament, interests, and abilities in mind.
墨西哥为研究环境活动及变化的社会成因和后果提供了关键性的素材。
Mexico provides a crucial context for studies about the social causes and consequences of environmental action and change.
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