Proponents of the "buckling" theory propose that the orbital floor is particularly vulnerable as the infraorbital canal further weakens the floor's already delicate bony structure.
“压曲”理论认为眶底壁更脆弱是由于眶下管所致，它导致原本就薄弱的眶下壁更加的脆弱。
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A current theory in evolutionary biology suggests that we have to be born long before we are able to look after ourselves so that our oversized heads can navigate the birth canal.