我查了一下,50天线越过200天线叫金叉。

A "golden cross" in stock trading refers to a bullish technical pattern where a short-term moving average crosses above a long-term moving average, typically the 50-day moving average crossing above the 200-day moving average. This crossover is generally interpreted as a signal of increasing upward momentum and a potential shift from a bearish to a bullish market. 

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