The fossil Brachycera contain a wider variety of flower visitors, which provide unique material for studying the origin of angiosperms.
虻类化石中的许多类群都有访花习性，它们为研究被子植物的起源提供了独特材料。
The fossil Brachycera contain a wider variety of flower visitors, which provide unique material for studying the origin of angiosperms.
虻类化石中的许多类群都有访花习性，它们为研究被子植物的起源提供了独特材料。
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