A cluster or group, as of trees.

簇；丛(如树丛)。

An extra thickness of sole.

加钉的一层鞋底。

Sound of heavy tramping.

重踏声。

Lump; mass.

一块；一团。

To arrange in a cluster or group.

使成群；使成簇。

To furnish (a shoe) with an extra sole.

鞋底加厚。

To tread heavily.

重步；重踏。

To form into clumps.

丛生。