当然在物理上，可能遇到的是空间的旋度。
为了使直升机在尘土中安全地着陆需要复杂的激光扫描仪去探测被旋翼的倒灌气流扬起的灰尘所隐藏的障碍物。
To land a chopper safely in the dirt requires sophisticated laser scanners to detect obstacles hidden by dust thrown up by the downdraught of the rotors.
旋度是下周的内容，你们习惯这个记号就行了，你们可能已经在物理课上用到过了。
Curl will be for next week. Just getting you used to the notation, especially since you might be using it in physics already.
顺便说一下，如果你好奇为什么在判断牙齿年龄方面、外消旋化会比碳14定义的时钟精度差之甚多，那么部分原因与温度相关。
By the way, if you're curious about why racemization is so much less accurate a clock than C-14 for dating a tooth's age, part of the explanation has to do with temperature.
莱斯特吹了吹它，正如我听工厂男孩们说的那样，粉末升起变成了一个旋儿，消失在空气中不见了。
Lester blew on it, and, just as I'd heard the factory boys tell it, the powder rose in a swirl, casting off into the air and disappearing.
它由两个喷气涡轮引擎提供动力，以驱动五个叶片的主旋翼，以及通过齿轮箱和连轴驱动在两边短翼上的一对螺旋桨。
It is powered by two jet-turbine engines which operate both the five-bladed main rotor and, through a gearbox and shafts, a pair of propellers on two short wings.
在复合大门里，工人们穿着涂球衣，戴着焊接护目镜，旋入螺钉。回到纽约，绿诺科技的股票冻结在40美分上。
Inside the gated compound, workers in tarred jerseys and goggles weld and drive screws. Back in New York, Rino's shares are frozen at 40 cents.
我没有把它们放在心上，但是热蒸汽以及充满气泡的蒸汽在懒惰的幻想的漩涡周围发着泡和打着旋，毫无目的，也没意义。
My mind had nothing in it but hot vapour, and vapour-filled bubbles frothed and eddied round a vortex of lazy fancy, aimless and unmeaning.
假如力场中某处有一小块固体，旋度度量的是固体在力场中的旋转程度，在力场里来观察。
If you have a small solid somewhere, the curl will just measure how much your solid starts spinning if you leave it in this force field.
在殿右边当中的旁屋有门，门内有旋螺的楼梯，可以上到第二层，从第二层可以上到第三层。
The entrance to the lowest floor was on the south side of the temple; a stairway led up to the middle level and from there to the third.
当他在舞台上得到机会有足够长的时间表演踢踏舞和旋地舞后，人人都迷上了他并欣喜若狂。
When he was allowed on the stage for long enough, tap-dancing and pratfalling all over the place, everyone loved him and the audience went wild.
她放下了陶工旋盘还有烧窑，一心一意集中在软陶上，她用软陶制作了小至项链，大至大件的工艺品。
She gave away her potter's wheel and kiln and began concentrating on the clay, with which she makes everything from necklaces to large works of art.
并且，在星系的红色旋臂和旋臂间螺旋状的轮辐中可以看到被新生恒星加热的尘埃。
And, the galaxy's red spiral arms and the swirling spokes seen between the arms show dust heated by newborn stars.
他说：“旋翼飞机在军事和商业上都发挥着关键的作用。
"Rotor craft specifically play a critical role for both military and commercial applications," he said.
许多人的发旋在头上翘成一团的主要原因是碰到了一个糟糕的理发师。
The reason many guys end up with cowlicks sticking up all over the place is because of an unskilled haircutter.
这就是F的旋度，在实际应用中，如果你必须计算一个向量场的旋度，不要尝试记忆这个公式。
And that is indeed going to be the curl of F. in practice, if you have to compute the curl of a vector field, you know, don't try to remember this formula.
具体来讲，想象一下，你要放东西在那里，如果是在一速度场内，旋度告诉你，在给定的时间他旋转的速度。
Concretely, if you imagine that you are putting something in there, you know, if you are in a velocity field the curl will tell you how fast your guy is spinning at a given time.
一个向量场,如果定义在单连通区域并且旋度为零，那么它就是一个梯度场，并且其上的线积分与路径无关。
OK, so, we've seen that if we have a vector field defined in a simply connected region, and its curl is zero, then it's a gradient field, and the line integral is path independent.
他决定把它们当成旋螺或蜗牛进行形态分析，试着导出它们在时间上的系谱史。
And he has decided to treat them as if they were tribolites, or snails, and to do a morphological analysis, and try to derive their genealogical history over time.
直升飞机那不停转动的旋翼叶片使其能够在空中悬停，但却限制了它向前的飞行速度。
Helicopters are limited in their forward speed by the spinning rotor blades that make hovering possible.
在左侧有模糊的蓝点，正好处于旋臂之间，它是一个伴星系。
The fuzzy blue dot to the left, which appears to fit snugly between the arms, is a companion galaxy.
它跨度近240光年，位于猎户座旋臂里，离地球3,800光年远；而我们的太阳系也在银河系同样的旋臂中。
It is located 3, 800 light-years away from Earth, inside the Orion spur — the same partial spiral arm of the Milky way where our solar system is located. The nebula is nearly 240 light-years across.
旋度衡量的是,在某点上的旋转的程度。
And what a curl will measure is how intense the rotation effectis at that particular point.
电场的旋度，在二者间产生了电压。
And the curl of the electric field will generate voltage between these two guys.
尽管，许多卫星在36000千米处形成一个类似土星光环的环，但这个高度的卫星都需要花费24小时绕地球一圈。因此，它们一直在地球上空的同一点盘旋。
Many, though, form a ring like Saturn's at a distance of 36,000km, the place at which an object takes 24 hours to orbit the Earth and thus hovers continuously over the same point of the planet.
这些旋椅连同排列飞船的高耸广告牌，将人们的注意力集中在操纵局势的大型公司Buy'N Large的广告上。
The chairs, along with the towering billboards that line the ship, keep people's attention focused on advertising for the mega-corporation running the show, Buy 'N Large
在马斯喀特（Muscat）的一个节日里，来自Al Buraymi绿洲的舞者挥动着她们的头发，就好像沙漠里打旋的风一样。 这个节日标志着阿曼十年的油资进展。
Like swirling desert winds, dancers from Al Buraymi oasis swing their hair at a festival in Muscat marking a decade of oil-financed progress in Oman.
在马斯喀特（Muscat）的一个节日里，来自Al Buraymi绿洲的舞者挥动着她们的头发，就好像沙漠里打旋的风一样。 这个节日标志着阿曼十年的油资进展。
Like swirling desert winds, dancers from Al Buraymi oasis swing their hair at a festival in Muscat marking a decade of oil-financed progress in Oman.
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