日本高清色视频在线视频在,国产香蕉97碰碰视频碰碰看,丰满少妇av无码区,精品无码专区在线,久久无码专区免费看,四虎欧美精品永久地址99,亚洲色无码一区二区三区

BBC Learning English 英語教學(xué)

Why suitcases rock and fall over – puzzle solved 科學(xué)家解開拉桿箱搖搖欲倒的物理謎題

文字稿

相信很多人都對下面的這個情景深有體會:為了趕火車或飛機(jī),我們費(fèi)力地拖著一個兩輪拉桿箱向前奔跑,而箱子會左右搖晃,眼看著就要翻倒,著實(shí)讓人提心吊膽?,F(xiàn)在,科學(xué)家們已經(jīng)針對這個令人費(fèi)解的日常物理難題展開了研究調(diào)查,結(jié)果他們發(fā)現(xiàn),避免該現(xiàn)象的方法可能和我們的預(yù)期有所不同。請聽報道。 

It’s a common experience when dashing for a train while lugging a two-wheeled suitcase, the bag rocks alarmingly from side to side and threatens to overturn.

To explain why this happens, French researchers studied a model suitcase on a treadmill and did some number-crunching. And it turns out, that rather than slowing down, as you might expect, you should actually speed up to tame your unruly suitcase.  

Scientists say, while it’s a fun way to tackle the problem, the study could have applications with other two-wheeled things from trailers to caravans

詞匯表

dashing 猛沖,突然奔跑
lugging 用力拖著
two-wheeled 兩輪的
suitcase 行李箱,這里指拉桿箱
rocks 搖晃,搖擺
alarmingly 令人驚慌地,讓人擔(dān)憂地
from side to side 左右、來回地
threatens 預(yù)示著、快要發(fā)生(不好的事情)
overturn 翻倒
treadmill 跑步機(jī)
number-crunching (人或計(jì)算機(jī)進(jìn)行的簡單而耗時的)數(shù)字運(yùn)算
tame 控制,駕馭
unruly 難控制的,難駕馭的
applications 用途,應(yīng)用
trailers (卡車后的)掛車
caravans (尤指用汽車拖著走的)旅行房車 

測驗(yàn)

請聽報道并回答下列問題。

1. What did French researchers do to explain the suitcase puzzle? 

2. What applications could the study have, according to the scientists? 

3. True or false? To control our suitcases, we should speed up rather than slow down. 

4. Which word in the text means ‘to deal with something difficult with determination’?

答案

1. What did French researchers do to explain the suitcase puzzle?
To explain the suitcase puzzle, French researchers studied a model suitcase on a treadmill and did some number-crunching.

2. What applications could the study have, according to the scientists?
The study could have applications with other two-wheeled things from trailers to caravans, according to the scientists.

3. True or false? To control our suitcases, we should speed up rather than slow down.
True. It turns out that rather than slowing down, as we might expect, we should actually speed up to tame our unruly suitcases. 

4. Which word in the text means ‘to deal with something difficult with determination’?
Tackle.

人氣排行
Copyright ©
<strong id="xdwva"><div id="xdwva"></div></strong>
<label id="xdwva"></label>

<thead id="xdwva"></thead>
    <label id="xdwva"></label>

  1. 日本高清色视频在线视频在,国产香蕉97碰碰视频碰碰看,丰满少妇av无码区,精品无码专区在线,久久无码专区免费看,四虎欧美精品永久地址99,亚洲色无码一区二区三区