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某些活动
1、activity───n.活动；行动；活跃
2、certain standards───某些标准
3、certain criteria───特定标准（criteria是criterion的复数形式）；某些标准（criteria是criterion的复数形式）
4、certain situations───确定的情况
5、certain n───确定n
6、certain───pron.某些；某几个；n.(Certain)人名；(葡)塞尔塔因；(法)塞尔坦；adj.某一；必然的；确信；无疑的；有把握的
7、certain field───特定领域
8、certain extent───一定程度；某种程度
9、certain level───某一水平
1、Why are the aged liable to indulge in a certain activity?───老年人为什么为沉溺某一项活动？
2、A certain activity, a movement, just at the top of the head starts working three days before one dies.───这是必然的行动——正好在头的最上边——在他死后三天前。
3、Keep a certain activity, can effectively reduce the body cause breast cancer cell growth estrogen level.───保持一定的活动量，可以有效地降低人体内引起乳腺癌细胞增长的雌激素水平。
4、Lesson 1: Quick Assist-Need help with a certain activity or have issues that need fixing fast?───第1课：快速协助-是否需要特定活动的协助，或发生需要快速修理的问题？
5、A person with a talent or an enthusiasm for a certain activity:───对某活动热爱的人对某项活动具有天才或热情的人：
6、Thermostable enzyme is a general name of enzymes which can still maintain a certain activity under high temperature.───耐热酶即热稳定性酶，它是一类在高温下仍能保持一定活性的酶的总称。
7、Up until today, all previous exercises of the commerce power had been to regulate activity or to prohibit certain activity.───直到今天，商业力量历届今已规范活动，或禁止某些活动。
8、The experience is not to stay around only in the process of the activity, it must accompany with a certain activity result.───体验不是仅仅停留在活动的过程中，它必须伴随着某种活动结果。
9、Don't jump in if they're doing a certain activity and you think they're doing it wrong.───当孩子在进行某项活动而你认为他们做得不对时，不要打断他们。