Three giraffes
你的器材不支持播放多媒体材料

The secret of giraffes' long legs 长颈鹿细长下肢的秘密

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.

词汇

sticking their necks out 冒风险

spindly 细长的、瘦弱的

hindrance 障碍,妨碍

evolutionary 生物进化的

modestly proportioned 身体比例均匀的