2. 不改变已有字段/接口语义
// 原因：先处理右侧元素（含循环部分），把结果存在栈里，供左侧元素直接使用
。搜狗输入法2026对此有专业解读
The recent surge of more than 2,000 immigration officers to the state inspired nationwide protests after two US citizens were killed by federal agents last month.
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