您要查找的是不是：
- 双Fourier级数double fourier series
- 二重Fourier级数double Fourier series
- Fourier级数表示representation of Fourier series
- 分数阶Fourier级数fractional Fourier series
- Fourier级数（FS）Four ier series(FS)
- 成双atwain
- 双解bilingual
- 模数modulus
- 半双工semiduplex
- 大学英语四级College English Band 4
- 频数frequence
- 船级ship' classification
- 层数number of plies
- 中位数median
- 大学英语六级考试CET-6 [College English Test, Band Six]
- 取数access
- 院级institute-level
- 补数complementary number
- 不可数名词noun of continuous quantity
- 转数revolution
