数十年来，许多地质学家认为，过去数百万年必定发生了一连串的个别喷发，才能造成广大的毕夏普凝灰岩。

For decades, many geologists assumed that a series of distinct eruptions over millions of years must have occurred to produce the extensive Bishop tuff.

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数十年来，许多地质学家认为，过去数百万年必定发生了一连串的个别喷发，才能造成广大的毕夏普凝灰岩。

For decades, many geologists assumed that a series of distinct eruptions over millions of years must have occurred to produce the extensive Bishop tuff.

youdao