How many times must you toss it, on average, before it comes up heads?
你平均需要抛它多少次才会出现一次头像朝上？
Let's say we have a coin that we can toss and that it comes up heads or tails with equal probability.
比方说，我们有一个硬币，我们可以抛，它是头或尾巴等概率。
You might say the probability that you toss a coin and it comes up heads is a half, because it's equally likely to be heads and tails.
你可以说概率是你投掷一个硬币，出现正面的机会是一半，因为出现正面和背面的机会是相等的。
请抬起你们的头。
Margaret Thatcher was also said to get by on four hours a night, while the 130-hour workweeks endured by tech heads has been held up as key to their success.
据说，玛格丽特·撒切尔每晚只睡4个小时，而技术负责人每周工作130个小时，这一工作时长是他们成功的关键。
Just like drones before them, miniature satellites are beginning to fundamentally transform our conceptions of who gets to do what up above our heads.
就像之前的无人机一样，微型卫星开始从根本上改变了我们的观念：谁能在我们的头顶上做什么。
When the airlines decided to enforce these rules without giving anyone a heads-up, it created a lot of problems for travellers.
航空公司在决定执行这些规定时没有事先通知任何人，这给旅客带来了很多麻烦。
Once they get an idea into their heads, they never give up.
他们一旦接受了某个想法，就永远不会放弃。
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。
They formed up in battle line, infantry in the center, cavalry on the wings, artillery to the rear firing over their heads.
他们排成作战队形，步兵在中央，骑兵在两翼，炮兵在后面朝他们头顶上方开火。
As we climbed up the hill, the air grew cooler and the Indian girls on the road wore shawls over their heads and shoulders.
在我们向山上爬行的过程中，空气变得凉爽起来，路上的印第安姑娘都披着披肩。
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。
They cannot even hold up their own heads without some help from grown-ups.
如果没有大人的帮助，他们甚至连自己的头都抬不起来。
They learn to roll over, support their heads, and even sit up while being held.
他们学会翻身、支撑头部，甚至在被抱着的时候坐起来。
And the proof is right above our heads. Up in space.
在我们的头顶上，太空就证明了这一点。
The pigs looked up and scratched their heads. Then they went back to sleep.
猪听到声音，只稍微往上抬抬眼，抓抓头，又继续睡了。
Neave builds up the heads from his extensive database on the relationship between skull, muscles and features.
尼夫根据他丰富的关于头骨、肌肉以及各部分功能的数据库建立起了这名水手长的头像。
These photos included universal displays of happiness (broad smiles), pride (raised heads, puffed-up chests) and shame (lowered heads, averted eyes).
这些图片包括了被公认的下列表情：快乐(开怀大笑)，骄傲(昂首挺胸)和害羞(低头，转移目光)。
Now he heads up the Weta department responsible for painting the surfaces of characters.
现在他是维塔一个部门主管，负责给角色模型的表面上图。
They popped up their heads and saw the forlorn little maiden.
他们探出小脑袋来，看见了这个可怜的小姑娘。
Would it be cool to email a heads-up to everyone in my address book?
将消息用电子邮件告诉地址簿里的每一个人，这是多么的酷啊！
The scientists say this mirrors computer simulations where test subjects respond much faster to approaching visual stimuli when those objects are on a trajectory lined up with their heads.
科学家们说，这反映在计算机模拟上，当物体处于和头同一条线的轨迹上，测试对象对于处理视觉刺激能做出更快的反应。
It also lets you set up an alert system, so if H1N1 arrives in your area, you'll get a heads-up.
这种应用程序还可以设置报警系统，因此，如果H1N1出现在用户附近区域，用户能立即获得警报。
Since plastic shower heads appear to "load up" with more bacteria-rich biofilms, metal shower heads may be a good alternative, said Professor Pace.
佩斯教授说道，“因为塑胶喷头‘藏’有更多装载大量细菌的生物膜，所以金属喷头不失为（淋浴时）一个好的选择。”
The thin heads of grain swallowed up the seven good heads.
这些细弱的穗子吞了那七个佳美的穗子。
"Toddlers keep their heads up more when they are walking barefoot," she says.
她表示：“当幼儿打赤脚时，他们就会把头抬起来。”
"Toddlers keep their heads up more when they are walking barefoot," she says.
她表示：“当幼儿打赤脚时，他们就会把头抬起来。”
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