Peter's heart bobbed up and down as he listened.
彼得听着，心忽上忽下。
They lay sleeping under a tree, and snored so that the branches waved up and down.
他们正躺在一棵树下睡觉，鼾声大作，使得树枝上下摆动。
There is growing support for the theory that migration took place much earlier, by sea, following a coastal route along Alaska and down the northwest coast.
越来越多的人支持这样一种理论，即移民发生得要早得多，是沿着阿拉斯加沿海路线，沿西北海岸而下通过海路进行的。
The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing.
不过，走鲸的脊椎结构显示，即使没有尾片，它们在水中同样能够像现代鲸鱼那样通过身体后面部分的上下摆动来游动。
All through breakfast I kept jumping up and down, clapping my hands and laughing out loud.
在吃早餐的时候，我一直在那儿上窜下跳，不停地拍手和大笑。
She seems very grounded and down-to-earth.
她看上去非常现实，注重实际。
The performers, in costume and makeup, were walking up and down backstage.
演员们穿着戏服化着妆，在后台走来走去。
He kept bouncing up and down like a yo-yo.
他像个悠悠球似的蹦蹦跳跳。
Tiny boats bobbed up and down in the harbour.
小船在港湾中颠簸。
She walked up and down, flapping her arms to keep warm.
她来回走动，挥动着双臂使身体暖和起来。
I strolled up and down thoughtfully before calling a taxi.
叫出租车前,我若有所思地来回踱步。
People were parading up and down showing off their finest clothes.
人们走来走去，炫耀着他们最漂亮的服装。
He immediately threw a tantrum, screaming and stomping up and down like a child.
他立刻发起脾气来，尖叫着，像孩子似的来回跺脚。
Then came steel strings, and that led to the lap guitar—which is also called the steel guitar because the player slides a steel rod up and down the neck.
然后出现了钢丝弦，接着膝上吉他就诞生了。膝上吉他也被称为钢吉他，因为演奏者会在琴颈上下滑动一个钢棒。
The water buffalo squelched up and down the paddy fields, pulling the plough.
水牛拉着犁，在稻田里咕唧咕唧地走着。
She bounced up and down excitedly on the bed.
她兴奋地在床上蹦蹦跳跳。
This is a subject very dear to the hearts of academics up and down the country.
这是全国学者都极为重视的话题。
When the unicorn saw the number stuck to my side, it started bouncing up and down in excitement.
当这只独角兽看见贴在我侧面的数字时，它开始兴奋地跳上跳下。
The network has shrunk by roughly a third since its postwar heyday, but more trains now trundle up and down the country than ever before.
自战后全盛时期以来，铁路网络已经缩减了约三分之一，但现在全国上下行驶的列车比以往任何时候都多。
Their wearisome heads went up and down at the same rate, in hot weather and in cold, wet weather and dry, fair weather and foul.
不管天气是冷是热，是干是湿，是好是坏，它们那疲惫的机头都会以同样的节奏上下摆动。
Quite near the rock, but out of sight, two heads were bobbing up and down, Peter's and Wendy's.
离岩石很近，但看不见的地方，有两个脑袋上下浮动，是彼得的和温迪的。
My little brother likes to jump up and down like a monkey.
我的小弟弟喜欢像猴子一样跳上跳下。
Truly my favorite part is to see the kids jumping up and down and they just get so excited.
我最喜欢的就是看到孩子们蹦蹦跳跳，非常兴奋的样子。
Totten usually walked up and down the rows of desks requesting answers from student after student in the order the questions had appeared on our homework sheets.
托顿通常在课桌旁走来走去，按照作业纸上问题的顺序一个接一个地向学生提问。
Some corporations shun the use of executive titles because they fear that the use of titles indicating position in the corporation tends to inhibit communication up and down the corporate hierarchy.
有些公司不使用高管头衔，因为他们担心在公司中使用表明职位的头衔会妨碍上下级之间的交流。
Then he walked calmly up and down as before.
然后就像刚才一样平静地来回走动。
You're methodical, practical and down to earth.
有方法，重实际，脚踏实地。
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