The sun is a giant nuclear fusion reactor, converting hydrogen into helium and releasing massive amounts of energy in the form of heat – and sound. Sound is essentially vibration and needs a medium to travel through.
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// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined）
注重发挥考核指挥棒作用，推动“完善高质量发展考核体系和干部政绩考核评价体系”，健全有效防范和纠治政绩观偏差工作机制；
next: [Function: next] // What to do after the command finishes