For her cover shoot, Clark, who has become something of a fashion star this year, showed off her abs in a Nike sports bra and low-rise Emporio Armani trousers. Underneath the roomy pants ...

LearnEngineering制作的动画，讲解的是汽车的防抱死制动系统（ABS）的工作原理！ABS既有普通制动系统的制动功能，又能防止车轮锁死，使汽车在制动状态下仍能转向，保证汽车的制动方向稳定性，防止产生侧滑和跑偏，是目前汽车上最先进、制动效果最佳的制动 ...