The main theory believe it or not gives credit to an extinct North African plant.

主要的理论认为这起源于已灭绝的北非植物。

And one of these flies found in Spanish amber dating to 105 million years ago actually had a clump of pollen grains in the hairs on its back -- from an extinct gymnosperm plant.

在 1.05 亿年前的西班牙琥珀中发现的其中一只苍蝇实际上在其背部的毛发中有一团花粉粒——来自一种已灭绝的裸子植物。