The PFM technology includes two kinds modes: constant width PFM and SWFM.
脉冲频率调制又包括了两种方式，即等宽pfm和SWFM。
Its mental influence on people also includes two kinds of tendency, optimism or pessimism.
金融技术化对人的心理影响存在乐观和悲观两种倾向。
Exploratory teaching method7 includes two kinds. One is imported teaching method, such as designed teaching method;
探索性教学方法包括两类，一类是国外引进的教学方法，如设计教学法；
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