What does a Dulu in Lagerstroemia mean?

"Yidulu" is a quantifier, similar to "a string" and "a hanging". Dulu, a northern dialect, describes the way things get together and is used as a quantifier to string things together.

The difference between "a unique road" and "a string": a string means that monomers are connected in turn to form a "chain" shape, such as "a string of beads"; Single dew refers to the disorderly connection of multiple objects, forming a "lump", "mass" and "cluster" shape, such as "a single dew grape"