Three giraffes
你的器材不支持播放多媒體材料

The secret of giraffes' long legs 長頸鹿細長下肢的秘密

文字稿

Sticking their necks out for scientific research.

These giraffes at a zoo near London are helping researchers find out just how their spindly legs work.

Experts are using special technology to measure the animals' leg movements. They want to see if being tall is a help or a hindrance to moving around.

The scientists also hope to solve the evolutionary mystery of how these animals developed from their more modestly proportioned ancestors.

詞匯

sticking their necks out 冒風險

spindly 細長的、瘦弱的

hindrance 障礙,妨礙

evolutionary 生物進化的

modestly proportioned 身體比例均勻的