Water environment impact is related to the style and strength of the activities and with the water areas self-purification ability.
旅游活动对水环境的影响除了与活动方式、活动强度有关外，与水域面积、自净能力亦有显著的关系。
American men toil for pay nearly 12 hours less per week, on average, than they did 40 years ago—a fall that includes all work-related activities, such as commuting and water-cooler breaks.
美国人比40年前平均每周少工作12小时-这个数值的下降包括所有与工作有关的事项，比如通勤时间和茶休时间减少了。
American men toil for pay nearly 12 hours less per week, on average, than they did 40 years ago—a fall that includes all work-related activities, such as commuting and water-cooler breaks.
美国人比40年前平均每周少工作12小时-这个数值的下降包括所有与工作有关的事项，比如通勤时间和茶休时间减少了。
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