The writing process is made up of four stages, and each stage involves certain activities.

写作的过程由四个阶段组成，每个阶段都包含一定的活动。

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Research shows that given 15 minutes of free play, four- and five-year-olds will spend a third of this time engaged in spatial, mathematical, and architectural activities.

研究表明，如果给定15分钟的自由玩耍时间，四到五岁的孩子会将其中三分之一的时间花在有关空间、数学和建筑的活动上。

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Four specific activities have been identified as major contributors to the desertification processes: overcultivation, overgrazing, firewood gathering, and overirrigation.

导致沙漠化的主要因素有四个：过度种植、过度放牧、过度砍伐、过度灌溉。

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"There is no way we can monitor the activities of each juror twenty-four hours a day.

VOA: special.2009.08.31

"For now it's like a honeymoon." "People come and see their products and IOM facilitated them to go to an expo in Jakarta and they made like 10 million rupiah in four days but they also need to understand how they can allocate that for their own promotion activities."

VOA: standard.2010.04.14

It emerged that British and Russian police were investigating the activities of four Russian government officials assigned to the European Bank for Reconstruction and Development .

ECONOMIST: Politics this week

Mr. PETER CLARKE (Anti-Terrorism Branch, Metropolitan Police): The investigation quite early led us to have concerns about the movements and activities of four men, three of whom came from the West Yorkshire area.

NPR: Police: Bombing Suspects Are British Natives

It doesn't harp on rejuvenation or even getting fitter: When I sign up for four activities in one day, I'm reminded that I can cancel them.

FORBES: Borrego Ranch has a new recipe for blending resort and spa.