It takes tens of thousands of years for the crust to generate enough eruptible magma, but once formed, these unstable magma bodies only last for centuries to a few millennia.
地壳聚集足够喷发的岩浆需要数万年的时间，但是一旦准备完毕，这些不稳定的岩浆体就只会在地壳内存在几百年到几千年的时间。
It takes tens of thousands of years for the crust to generate enough eruptible magma, but once formed, these unstable magma bodies only last for centuries to a few millennia.
地壳聚集足够喷发的岩浆需要数万年的时间，但是一旦准备完毕，这些不稳定的岩浆体就只会在地壳内存在几百年到几千年的时间。
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