Wearing a helmet is the single most effective way of reducing head injuries and fatalities resulting from motorcycle and bicycle crashes.
带头盔是减少由摩托车和自行车撞车造成的头部损伤和死亡的单一最有效办法。
2
The concepts are actually not complicated, and with a few simple algebraic tips you will be able to do the math in your head as well, leading to more effective negotiation.
其实概念一点儿不复杂，只要有些简单的代数知识，你也能心算，这样谈判起来就更有效了。
3
Preventing head injury is the most effective way to prevent post-traumatic epilepsy.