One chilly night when I was hiking in the Rocky Mountains with some students, I mentioned that we were going to cross a mountain stream.
一个寒冷的夜晚，当我和几个学生在落基山脉徒步旅行时，我提到我们将要渡过一条山间小溪。
You should learn from insects when they try to cross a wall, they fall down again and again until at some time they get success.
你应该向昆虫学习，当它们试图越过一堵墙时，它们会一次又一次地倒下，直到某个时候它们成功了。
But when they cross a busy road by using a zebra crossing, the traffic is held up.
但是当他们利用斑马线通过繁华的马路时，交通就被阻碍了。
Two weeks ago, on a hot summer afternoon, I was about to cross a little busy road when I noticed an old grandpa with a heavy bag on his back just a few meters from me.
两周前，一个炎热的夏天的下午，我正要穿过一条有点繁忙的马路，这时我注意到一位背着一个沉重的包的老爷爷就在离我几米远的地方。
Many are self-steering, use GPS to cross a field, and can even "talk" to their implements—a plough or sprayer, for example.
很多都是自动驾驶的，使用GPS穿越田地，甚至可以和他们的工具“交谈”——比如，与犁或喷雾器。
What do you get when you cross a cow with a buffalo?
当你将一只奶牛和一只水牛杂交时你得到了什么？
I saw it create a bridge to cross a deep hole.
我看见它为了穿过深洞，造了一座桥。
Cross a frontier without adjusting and you can be in deep trouble.
不进行调整就跨越边界，你可能会遇到大麻烦。
On January 31, a musher named Seppala had to cross a frozen body of water called Norton Sound.
1月31日，一位名为塞帕拉的赶狗人必须穿越一个叫诺顿湾的冰冻水域。
Although they were traveling to an island, it didn't touch them that they didn't even cross a bridge or see the sea.
虽然他们是去一个小岛旅行，但他们甚至没有走过一座桥，也没有看到大海，这一点都没有触动他们。
As we were about to cross a busy street that was filled with traffic, you took my hand suddenly and shouted, "Hang on to me, Mom," then led me safely across.
当我们正要穿过一条到处是车的繁忙街道时，你突然拉着我的手喊道：“妈妈，抓住我。”然后带我安全地过了马路。
It took nearly two hours to cross a quarter mile of trash ice.
花了将近两个小时才穿越了四分之一英里的碎冰。
Introduced correctly, learners "cross a fear-barrier" - this journey has wider benefits in terms of confidence.
经过正确的引导，初学者“跨越了恐惧障碍”，这种经历有利于信心的建立。
Bucking occasionally on the rail, we began to cross a series of viaducts built a century before over the bends in the river.
路轨有时拱起，我们开始跨越河湾上一连串建于上世纪的桥梁。
He cross a brook and avoided the chase.
他穿过一条小溪才得以躲过追击。
If you're willing to cross a busy street to pick up a? 20 note, the economist who put it there can infer something about your willingness to accept risk.
如果你愿意横穿一条繁忙的街道，去捡一张20英镑的纸币，把钱放在那里的经济学家可推断出一些与你承受风险的意愿有关的东西。
Guitarists now worry that every time they cross a state border with their instrument, they will have to carry sheaves of documents proving that every part of it was legally sourced.
吉他手现在携带他们的乐器穿越州界时总是会担心，因为他们不得不同时携带大量文件证明吉他上的每个部件都有合法来源。
He looks up -- sees one cross a limb overhead.
他向上看——看见一个黑影掠过头顶的树枝。
Or is she an elfish spirit, who, as the legends of our childhood taught us, is forbidden to cross a running stream?
要不，说不定她是个小精灵，象我们儿时的童话所教的，她是不准渡过流淌的溪流的吧？
Light takes seven microseconds to cross a sample only eight thousandths of an inch long; in the vacuum of space, light would go more than a mile in the same time.
光穿过只有八千分之一英寸长的试样需要七微秒，而在空间真空中，光在同样长的时间内可能会行驶一英里多。
A climber USES a ladder to cross a crevasse at Everest's Khumbu Icefall, not far above base camp.
在宿营基地上方不远的地方，一名登山队员用梯子穿过珠穆朗玛峰的昆布冰川。
What do you get when you cross a bus with a train?
当遇到一辆带火车的公交车的时候，你会怎么办？
The K21 can travel as fast as 70 kilometers per hour on paved roads and cross a river at a speed of 7.8 kilometers per hour with the help of its water-jet propulsion system.
K21可以以每小时70公里的速度在铺设的道路上行驶，喷气推进系统能每小时加速7.8公里，以这速度可以穿越过一条河流。
Go behind the hotel, knock at the correct door, walk through the hotel's busy kitchens, cross a courtyard, then knock at another locked door.
来到酒店后面，敲对某一扇门，走过酒店忙碌的厨房，穿过一个院子，再敲另一扇门。
A northern or Central Line would face severe winter weather. And it would have to cross a wild area called Nebraska.
北方或中部那两条铁路线在冬天面临恶劣的天气，而且这两条路将通过一个叫内布拉斯加的荒野。
A model that predicts how long it will take a group of pedestrians to cross a busy intersection, for example, generally fails to reconstruct the chaos seen when people try to escape a crowded room.
例如，一个预测行人过繁忙的十字路口要用多长时间的模型，通常都不能重现人们拼命逃离拥挤房间的混乱景象。
At one point in the journey she had to cross a river.
在路上，有一处她必须要过一条河。
At one point in the journey she had to cross a river.
在路上，有一处她必须要过一条河。
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