How long each activity should take to complete.
每一种活动需要多长时间来完成。
To add an activity, users must scroll down the long list of possible activities.
要添加一项活动，用户必须向下滚动长活动列表。
The data, however, show sudden bursts of activity and long quiet periods.
然而，数据显示的却是突然爆发的袭击行动和很长的平静时期。
In a classroom noise is good, as long as it is the noise of activity.
在教室里，热闹是好事，但前提是这种热闹是因课堂活动而起。
Tourism, as an activity of human social life, has long history.
旅游作为人类社会生活的一项活动，有着悠久的历史。
There has been a long time for my family not to go out for the activity, because my father is busy all the time.
对于我的家人来说，我们已经有很长一段时间没有外出活动了，因为爸爸总是很忙。
Translation is a long lasting human activity.
翻译是不同民族语际交流的实践活动。
The short cell always had higher peroxidase activity than that of the long cell.
短细胞伸长停止与高过氧化物酶活性有关。
This activity has been rooted in China for quite a long time.
遛鸟在中国已经有很长时间的历史了。
Activity learning is a learning style with a long history.
作为一类学习方式的活动学习源远流长。
Walking long distances was not a rare event and was seen as an enjoyable activity.
那时，长距离的步行并不稀奇，反而被当作一种享受和乐趣。
Third, TV news could provide a meaningful leisure activity to audience during a long holiday.
第三部分，长假期间电视新闻休闲学理念初探。
Third, TV news could provide a meaningful leisure activity to audience during a long holiday.
第三部分，长假期间电视新闻休闲学理念初探。
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