灌木 是 一类 植物。树 通常 有 一个 茎，在 某个 高度 有 枝。灌木 可以 从下到上 有 多个 茎。通常，灌木丛的 高度 不如 树木 高，通常 它们的 高度 不到 10-12米。
A shrub or bush is a category of plants. A tree usually has one stem, which at some height has branches. A shrub can have multiple stems from the bottom up. Usually, bushes do not grow as tall as trees, very often they are less than 10–12 m tall.