The brains of teenagers, but not adults, showed greater activity in two regions associated with rewards when they were being observed by same-age peers than when alone.
青少年在被同龄的人观察时，大脑中两个与奖励相关的区域比独处时表现出更剧烈的活动，成年人则不然。
Those who use self-defeating humor, making fun of themselves, for the enjoyment of others, tend to maintain that hostility toward themselves even when alone.
那些自黑式的幽默，拿自己开玩笑，来让别人开心的人，即使在独处的时候往往也会对自己怀有敌意。
Dogs almost never wag their tails when alone.
当狗狗独自一个待着时，几乎是不摇尾巴的。
One should never succumb to fatigue when alone on the battlefield.
一个士兵永远不该在战场上屈服于困倦。
Two people can feel it when alone together and recognise that they are falling in love.
当两个人单独相处而且大家都意识到喜欢对方的时候也会感到尴尬。
We perceive when love begins and when it declines by our embarrassment when alone together.
我们由仅余两人时的局促不安察觉爱情于何时发生，何时减退。
For instance, a person might be ordinary when facing strangers, outgoing among close friends and sentimental when alone.
比方说，一个人面对陌生人就可能是个普通青年，在亲密的朋友面前会有点肆无忌惮，而一个人独处时又会多愁善感。
Still, she always thought of it as hers, and, when alone in the house, she opened it, she experienced a flush of childish excitement.
可她始终认为自己就是这个柜子的主人。每当独自一人在房子里打开它的时候，心里总有一股兴奋的感觉，就像小孩子一样。
Those who use self-defeating humor, making fun of themselves for the enjoyment of others, tend to maintain that hostility toward themselves even when alone.
那些用自我诋毁式幽默的人，牺牲自己而取悦他人，反而会把让自己陷入窘境，即使他们自己一人时也会遇到这样的情况。
It can be very hard to think rationally when you're feeling so vulnerable and alone.
在你感到如此脆弱和孤单的时候很难理性地思考问题。
When left alone in the room, the students who did not know which ones would shock them clicked more pens and incurred more shocks than the students who knew what would happen.
当他们被单独留在房间时，那些不知道哪些笔会对自己产生电击的学生比那些知道将会发生什么的学生按动的笔更多，也受到更多的电击。
When my parents invited him to stay with us, he refused and said he liked living alone.
当我父母邀请他和我们一起住时，他拒绝了，说他喜欢独自生活。
When Captain Cook asked the chiefs in Tahiti why they always ate apart and alone, they replied, "Because it is right."
当库克船长问塔希提岛的酋长们，为什么总是和其他人分开并单独吃饭，他们回答说：“因为这是正确的。”
When he wanders along the road with his twisted stick we are all afraid to meet him alone.
当他拄着他那根弯曲的拐杖在路上闲逛时，我们都害怕单独遇到他。
When my classmates play games happily outside, I have to stay at home and look out of the window alone.
当我的同学在外面开心地玩游戏时，我不得不呆在家里，独自看着窗外。
He laughs sometimes in a queer way when he's alone with Miss Mary.
当他和玛丽小姐单独在一起时，他有时会奇怪地笑。
The researchers discovered that the number of risks teens took more than doubled when their friends were watching, compared with when they played alone.
研究人员发现，与单独玩耍时相比，青少年在朋友旁观时所承担的风险是前者的两倍以上。
When he awoke, he found himself alone, and saw that the ring was gone from his finger.
当他醒来时，发现只有他一个人，戒指也不在他的手指上了。
When at last the heavens were steady again, John and Michael found themselves alone in the darkness.
当天空终于平静下来时，约翰和迈克尔发现黑暗中只有他们两人。
When they were alone with the cows, they often sang beautiful and peaceful songs to calm the animals and to overcome their own fear.
当他们单独和牛在一起时，他们经常唱一些优美而平和的歌曲来安抚牛羊，克服自己的恐惧。
I missed the stimulation of working with others when I tried to go it alone.
当我试着自己单干时，我想念和别人一起工作的那种刺激。
When a cow is with its friends, it feels relaxed, compared with when it is alone.
和当它独自一人的时候相比，当奶牛和它的朋友在一起时，它会感到放松。
The psychologist alone can ask such questions: Why do we smile when pleased and not scowl?
只有心理学家才会问这样的问题：为什么我们高兴时微笑，而不是怒容满面？
When we returned from school, we were alone for about half an hour, until mom was home from work.
当我们从学校回来，我们独自呆了约半小时，直到妈妈下班回家。
The tree house was Zach's favorite place to go to when he wanted to be alone.
当扎克想独处的时候，树屋是他最喜欢去的地方。
As for students, we should be honest when we're alone, too.
对于学生来说，当我们独处的时候应该做到诚实。
When she was alone, Mary felt lonelier than ever.
玛丽独自一人时，她感到前所未有的孤独。
The old people require more care and attention when they live alone.
老年人独居时需要更多的关心和照料。
The old people require more care and attention when they live alone.
老年人独居时需要更多的关心和照料。
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