主根垂直向下生长，以固定树身，并吸取深处的水分。
The taproot grows straight down to anchor the tree and reach for deep water.
垂直向下生长的宿存主根。两年生的植物常具有可以储存养料的肥大直根，如：胡萝卜。
Taproot a persistent primary root that grows vertically downward. Swollen taproots used for food storage are common in many biennial plants, such as carrot (Daucus carota).
直根：垂直向下生长的宿存主根。
Taproot A persistent primary root that grows vertically downward.
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