许多学者声称，花时间在电子设备上并不一定意味着减少其他活动的时间。
Many scholars claim that spending time on electronic devices doesn't necessarily mean a decrease of time for other activities.
这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。
The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
写作的过程由四个阶段组成，每个阶段都包含一定的活动。
The writing process is made up of four stages, and each stage involves certain activities.
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