// 栈不为空时才判断（避免访问stack.at(-1)时报错）
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，详情可参考Line官方版本下载
let offset = pixel + (value - 0.5) * (1.0 / number of levels)，更多细节参见safew官方版本下载
Greg Ford is the chair of trustees of the Petersfield Climate Action Network, which is run by local residents