时差N小时:自然界的直升机
日期:2014-10-20 15:09

(单词翻译:单击)

RZ.Nre-j#Fit]=+=zp8*%gZQZtx2

Most birds flap their wings up and down, but hummingbirds move their wings in a figure-eight pattern.
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jEb!k1Z6fa
With each flap they twist their wings one-hundred-eighty degrees so that they create a downwardthrust on both the forward and backward strokes.
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=@O0;!uS*XsX
If each loop of the wings is of the same strength, they hover.
如果每次翅膀旋转的力度一样,蜂鸟就会盘旋在空中zkn|mXEc*QJT-9
They can go forward, backwards, orsideways by tilting their wings in the direction they want to go.
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hz=BBfrP[r
Kind of like a helicopter.Exactly.
就像直升机一样71,WfqdL[KQ]~ArgHzG7。是的,-NsGmepPqry2!h8mvir

%lk07|35S.z

Vms*N^A(Zk1h5]AX


In order to hover, hummingbirds have to be really strong.
要盘旋在空中,蜂鸟必须得很强壮F^|zk@H)@&4~@
Their wing muscles are thirty percent oftheir total weight.
它们翅膀的肌肉重量占身体整个体重的三分之一juE3!RRg9*
When a small hummingbird hovers it flaps its wings about eighty times persecond.
一只小蜂鸟盘旋在空中时,翅膀的震动频率约为每秒80次1m91Ry8xbuE%2=
Hummingbirds have to eat close to fifty percent of their weight in food everyday to keep up theirstrength.
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U~qWZnuKBo1
They eat things that are packed with calories and produce lots of reusable energy, likeseeds, nuts, fruit, and nectar.
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*bEYJY=sNw&9

4XY)H4Cr#jp7_|5,6hki5Q^sZv;wr=(hD
分享到
重点单词
  • twistv. 拧,捻,搓,扭曲 n. 扭曲,盘旋,捻,拧
  • producen. 产品,农作物 vt. 生产,提出,引起,分娩,制片
  • patternn. 图案,式样,典范,模式,型 v. 以图案装饰,仿造
  • flapn. 拍打,拍打声,片状垂悬物(口袋盖等),副翼 v.
  • hovervi. 盘旋,翱翔,徘徊 n. 盘旋,翱翔,徘徊