从输入图像（src）中指定一个 ROI 区域
Associativity: when merging three (or more) states, it doesn’t matter which are merged first; (A ∨ B) ∨ C = A ∨ (B ∨ C). If Alice receives states from both Bob and Carol, she can merge them into her own state in any order and the result will be the same.4
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第一百九十七条 被救助方在救助作业结束后，应当根据救助方的要求，对救助款项提供满意的担保。