It is simple pleasures, such as a walk on a sunny day, which have a cumulative effect on our mood.
诸如在晴朗的日子散步这样简朴的乐趣对我们的情绪有累积性益处。
And hundreds of kinds of birds have been sighted in the park which serves as a stopping area for birds as they fly to other places.
VOA: special.2009.10.30
And there's a lot of social psychology research as to the conditions in which you have to bring them together.
很多社会心理学研究,研究他们发生接触的环境。
Yeah, so also 4. We started with 10 valence electrons, we used up 6 of those as bonding electrons, so we have 4 left, which will be lone pair electrons.
对,也是四个,我们从十个价电子开始,只用了六个来成键,因此我们还剩下四个,它们将成为孤对电子。
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