2. Women Are Both the Most Affected and the Most Powerful Force for Change
"You're almost on something with the equivalent speed of a motorised vehicle, but not wearing a motorbike helmet," Burns says, noting that motorbike riders typically wear other protective gear such as leathers and gloves.
。关于这个话题，PDF资料提供了深入分析
for t := range c {
derivative of cat|dog and c is der(cat,c) | der(dog,c), which is at|∅ and simplifies to at