translation.en: 1971, we saw it spread to Europe and South America, and then, when we get to the 1980s, and specifically to 1987, the varroa mite finally came to North America and to the United States, and that is when the game changed for honeybees in the United States.
translation.zh: 到了1971，他传到欧洲和南美洲 然后，再到1980年代 准确来说是1987，蜜蜂蟹螨 终于抵达北美洲和美国 而也就是那时 美国蜜蜂的状态彻底改变