The researchers looked at time spent in a number of activities that could plausibly be driving the wellbeing decline.

研究人员观察了一些可能导致幸福感下降的活动所花费的时间。

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The researchers looked at time spent in a number of activities that could plausibly be driving the well-being decline.

研究人员观察了人们在一些活动上花费的时间，这些活动似乎是导致幸福感下降的原因。

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Note that a number of activities are shown in Figure 4.

注意图4中显示了很多活动。

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The United States,however, became involved unofficially in a number of league activities.

VOA: special.2011.02.03

Agricultural experts blame a number of farm activities for producing greenhouse gases.

VOA: special.2010.01.05

In addition, NCHD has also implemented a number of activities and programmes to consolidate the ALP and to promote lifelong learning.

UNESCO: National Literacy Programme (NLP)

Children are the primary beneficiaries of the festivities and take part in a number of activities, such as decorating hard-boiled eggs.

UNESCO: Culture

But there had been a number of activities that North Koreans have been involved in, terrorist activities in South Korea and other parts of the world.

NPR: North Korea Dropped From Terror List