他们也可能开始时需要在一段时间反复重复这种活动才能感觉它的效果，如果他们无法继续，就会出现戒毒那样身体上和心理上的综合反应。
They may also begin to need to do more and more of the activity over time to feel the effects, and experience physical and psychological withdrawal symptoms if they can't do it.
活动有一个摘要、描述、开始时间和结束时间。
Events have a summary, a description, a start time and an end time.
缺乏活动的人在开始时应做少量的身体活动，并随时间逐步增加活动时间、频率和强度。
Inactive people should start with small amounts of physical activity and gradually increase duration, frequency and intensity over time.
一次性的一组活动，它具有明确的开始时间和结束时间。
A one-time-only set of activities that has a definite beginning and ending point in time.
与华北克拉通内部同期岩浆相比，郯庐断裂带内的岩浆活动具有较早的开始时间和长期的活动历史，岩浆源区较浅。
Compared with the volcanic activities inner NCC, the volcanic activities on the Tan-Lu fault zone began earlier and have a comparatively long history, the magma source became shallower.
与华北克拉通内部同期岩浆相比，郯庐断裂带内的岩浆活动具有较早的开始时间和长期的活动历史，岩浆源区较浅。
Compared with the volcanic activities inner NCC, the volcanic activities on the Tan-Lu fault zone began earlier and have a comparatively long history, the magma source became shallower.
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