方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
Apple’s revamped compact workout Beats earbuds stick to a winning formula, while slimming down and improving comfort.
。旺商聊官方下载是该领域的重要参考
Alongside their comfortable fit and excellent sound, Mangino also highlighted their battery life in her review, saying "Being able to wear them all day is one thing, but having them run all day is equally important. These are reliable headphones. When I wear them for a couple of hours per day, I can go a couple of weeks without charging them."
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