Customers had to pay a deposit for the sturdy glass bottles. They then got this money back when they returned them to the shop. And the bottles would be washed and refilled over and over again.
https://doi.org/10.48550/arXiv.2602.18602
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Now, it seems, the nuclear engineers are relenting.
// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错