大约在这个时候，这些中心中最大的 Cuicuilco 受到了火山喷发的严重影响，它的大部分农田被熔岩覆盖。
Around this time, the largest of these centers, Cuicuilco, was seriously affected by a volcanic eruption, with much of its agricultural land covered by lava.
大约在这个时候，我开始和一个中国男人在一个乐队里演奏，他成了我在北京最好的朋友之一。
Around this time, I started playing in a band with a Chinese man who became one of my best friends in Beijing.
大约在这个时候，我发现了钥匙的妙用。
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