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This is known as modulation .

这一过程就是调制。

It was modulation , frey discovered , that induced the widest variety of biological effects .

佛瑞发现，正是调制诱发了种类最为广泛的生物效应。

Incandescent light bulbs and fluorescent tubes are not really suitable for modulation , but they are yesterday 's lighting technology .

白炽灯和日光灯的光其实并不适合调制，不过它们已是旧式的照明技术了。

The 4d means four data symbols ( two bits ) , the pam5 is pulse amplitude modulation with five signal levels .

4d指四个数据符（2比特），pam5表示分5个层级的脉冲幅度调制。

B. anxiety modulation : this occurs via the brain 's anxiety network , which spans many regions , such as the orbitofrontal cortex .

焦虑的调节：这是通过大脑中的焦虑网络形成的，该网络覆盖了包括像前额脑区的这样的许多区域。