想要在女性消费市场分一杯羹的品牌也必须看到这一点，这固然是一片增量市场，但它的入场门槛正在变高，不仅需要持续构建技术和品牌的护城河，而且需要更深入和理解女性处境，完成品牌价值的传递，而非悬浮地空谈。
Horizontally, we also have two forces. There’s the force of you pushing on the book from left to right, and again there must be an equal force pushing in the opposite direction. We call that resisting force static friction—“static” because the book’s not budging. This depends on just two things, the specific materials in contact, captured in a coefficient μs, and the normal force (N):
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