这些气源岩主要为浅湖—深湖沉积产物；

These source rocks mostly are sediment of shore lake-shallow lake;

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但米歇根湖邻近城市的部分较安大略湖要浅很多。

But close to the city, Lake Michigan is shallower than Lake Ontario.

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湖如此浅以致于里面没有鱼。

So shallow is the lake that no fish can live in it.

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湖如此浅以致于里面没有鱼。

So shallow is the lake that no fish can live in it.

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