Any of several plant hormones, such as gibberellic acid, used to promote stem elongation.

赤霉''.'素'.''一种植物荷尔蒙, 如赤霉''.'酸'. '', 用来促进植物茎部生长.

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Adjustable pole position, when the stem elongation is vertical feed volume increased, contrary vertical feed reduced.

顶杆的位置可调, 当顶杆伸长则垂直进刀量增大, 反之垂直进刀量减少.

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