Do certain activities less often and some new ones, more often.
对于某些活动要少做些，同时要多做些新的事情。
Certain activities within a process may be associated with a control point.
过程中某些活动可能与控制点相关。
Similarly, certain activities can't be done with a certain number of people.
类似的迷信还有：某些活动不允许某一特定数目的人同时参加。
Collective on the same level can also use notice to carry out certain activities.
同级单位之间也可采用通知的形式互相协商开展某活动。
Another problem is that certain activities are attractive because we do them so rarely.
另一个问题是，有些活动对我们很有吸引力，那是因为我们很少去做。
Certain activities that are considered high risk by your insurance company will not be covered.
一些活动被认为高危事项所以保险公司不会负责。
If this continues, they can worsen and may make certain activities difficult or even impossible.
长此以往，情况会逐渐恶化使某些活动难于完成甚至无法完成。
Certain critical activities within a process may be associated with a control point.
过程中的某些关键活动可以与控制点相关联。
Or suppose there were certain death-free activities.
或者假设存在特定的死亡免疫活动。
Matriarchal commune period, people have been able to certain long-term activities.
母系氏族公社时期，人们已经能够在一定的地区长期活动。
Matriarchal commune period, people have been able to certain long-term activities.
母系氏族公社时期，人们已经能够在一定的地区长期活动。
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