text_line 将使用提供的高度值作为字体的刻度值来设置字体。
text_line sets the font, using the supplied height value as the scale value for the font.
记得三个月前，紫竹花刚六点三厘米，我为了测量紫竹花的高度，我特意插上一根竹干，并在上划上刻度。
Remember three months ago, Zizhu spent just six point three cm, I in order to measure the altitude of the bamboo, I have to put on a bamboo stem, and draw scale.
并认为流量与转子所处的高度非线性关系；流量的刻度标定也是非简单线性变化。
The results show that the relationship between the flow and the height of the rotor is not linear, and that the flow scale on the meter is uneven.
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