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2017年10月23日 03:18:00来源:兰州晨报

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  • Natures Helicopters自然界的直升机Most birds flap their wings up and down, but hummingbirds move their wings in a figure-eight pattern. With each flap they twist their wings one-hundred-eighty degrees so that they create a downward thrust on both the forward and backward strokes.大多数的鸟是上下拍打翅膀飞行,但蜂鸟不一样,它是以八字形移动翅膀。蜂鸟每次拍打翅膀都会旋转180度,以便为前后的拍打创造一个推力。If each loop of the wings is of the same strength, they hover. They can go forward, backwards, or sideways by tilting their wings in the direction they want to go. Kind of like a helicopter.Exactly.如果每次翅膀旋转的力度一样,蜂鸟就会盘旋在空中。它们只要往想去的方向倾斜翅膀,就可以前进,后退,或横向移动。就像直升机一样。是的。In order to hover, hummingbirds have to be really strong. Their wing muscles are thirty percent of their total weight. When a small hummingbird hovers it flaps its wings about eighty times per second.要盘旋在空中,蜂鸟必须得很强壮。它们翅膀的肌肉重量占身体整个体重的三分之一。一只小蜂鸟盘旋在空中时,翅膀的震动频率约为每秒80次。Hummingbirds have to eat close to fifty percent of their weight in food everyday to keep up their strength. They eat things that are packed with calories and produce lots of reusable energy, like seeds, nuts, fruit, and nectar.蜂鸟每天吃的东西是它们体重的二分之一,这样才能维持体力。它们吃的东西都是高热量食物,能产生大量可重复使用的能量,像种子,坚果,水果和花蜜。 /201301/219192
  • Dehydration脱水If I were to stop drinking water right now, how long could I live?如果从现在开始停止喝水,能活多久呢?There are different factors involved here. A human being isn’t an automobile which needs a certain amount of gas. There are conditions under which a person could die of dehydration within a single day, and other conditions whereby a person might live for over a week. It’s unlikely, though, anyone could go much beyond that.这涉及到很多方面的因素。人不是汽车,只需要一定量的汽油就行了。有时候,人体脱水一天便会死亡;但是有时,人体可以在脱水的情况下存活超过一个周。但是,任何人在脱水的情况下都不能长久的生存。Water comes into our systems not just from drinking but from eating as well. It goes out of us through urine, through sweat, and even through exhaling. Ever notice the fog you can make on a window by breathing on it? That’s water vapor leaving your body.我们的身体不仅通过喝水获得水,还通过吃饭。我们的身体通过排尿、出汗,甚至是呼吸将水排出体外。有没有注意到自己往窗户上呼气形成的水雾呢?那就是从体内排出的水蒸汽。The biggest reason it’s bad to lose too much water is that the actual volume of your blood goes down. When blood volume goes down, blood pressure goes down. As blood pressure goes down, body heat goes up, because your blood helps regulate your core body temperature. Without enough blood, you can’t cool off. Pretty soon you overheat.人体不能流失过多水分的最重要原因是因为会导致人体实际血容量减少。当血容量减少时血压也会随之降低。由于血液有助于调节人体温度,因此当血容量减少时,体温便会升高。如果血容量不足,人体便无法冷下来,很快,就会热得让人受不了。So various factors, from eating to circulatory health to the ambient temperature, play a part in how long you could go without water. Probably the biggest factor, though, is simply age: young people are much more likely to overheat faster than adults, which is why it’s especially important to keep an eye on the little ones on hot summer days.因此,从饮食到循环系统的健康再到环境温度,众多的因素决定了一个人在脱水的情况下能存活多久。但是,可能最重要的因素只是简简单单的——年龄:年轻人比成年人更快更容易过热,这也就是为什么在炎热的夏天要特别留神照顾小孩子了。 /201303/227730
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