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《纽约时报》Strands核心词提示：垂直还是水平？今日核心词呈对角线排列。
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SAVE $151.99: The Sony ULT Tower 9 Bluetooth Karaoke Party Speaker is on sale at Amazon for $748, down from the list price of $899.99. That's a 17% discount and the lowest price we've seen this year at Amazon.
哪些函数实际负责变更 goroutine 状态？