通过修改文本块中不同字符的字体颜色值，将水印以正弦波的特征形式嵌入文本中。
After the modification, the font colors of various characters show the characteristics of a sine wave.
在一定加热功率下，正弦管能有效抑制系统产生的二阶谐波，提高一阶压力波动幅值并降低加热块温度。
The experiment result showed that sinusoidal tube can effectively inhibit second order harmonic mode, increase first order pressure amplitude and lower down heating block temperature.
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