当前紧张局面集中在钇、钪等稀土家族中的“小众元素”上，这些元素在国防技术、航天工业及半导体制造中虽用量极小，却起着难以替代的关键作用，而其生产几乎完全依赖中国。
For some boards, remapping or programming keys using software is a crucial feature. Gaming peripherals have extra keys that you can set to execute a series of keystrokes with the push of a single button, and we cover the best gaming keyboards in a separate guide. Keyboards that work with layers, in which a single button can perform several functions, typically allow you to change what those are. Some ergo keyboards have non-standard layouts, like thumb clusters with multiple keys near the space bar that you operate with your thumb. You’ll also be able to program those.
。51吃瓜对此有专业解读
If you've been online in the past few weeks, I'm sorry. That's a general comment, but it especially goes for if you've seen posts and articles about someone named Clavicular.
// 原因：先处理右侧元素，把结果存在栈里，供左侧元素直接使用