Auxin, for instance, stimulates the rate of cell elongation, causes shoots to grow up and roots to grow down, and inhibits the growth of lateral shoots.
例如，生长素刺激细胞延伸的速度，促使芽和根生长，而抑制侧枝的生长。
Certain concentration of sucrose solution is helpful to growth of pollen tube; both 10% and 20% sucrose solutions can significantly increase elongation velocity of pollen tube.
一定浓度的蔗糖溶液有助于花粉管的生长，10%、20%蔗糖浓度均能显著提高花粉管伸长速度。
The growth of a pine shoot is often represented as the springtime elongation of a bud laid down the preceding summer .
松树枝梢的生长常常被说成是上年夏季形成的芽的春日伸长。
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