1. The periodic table now contains all the elements known to man arranged in their proper sequence. 
   现在周期表包括人类已知的全部元素，这些元素按适当的顺序排列起来。
2. The number of repetitions of a complete sequence of values of a periodic function per unit variation of an independent variable. 
   频率当自变量变化一个单位时，周期函数取同一完整数序的重复次数
3. A sequence of elements arranged in order of increasing atomic number and forming one of the horizontal rows in the periodic table. 
   元素周期一系列元素按原子序数升序排列形成的周期表中的一个横排
4. Direct-sequence spread spectrum (DSSS) takes a signal and "spreads" it over several frequencies, essentially creating redundant signals. 
   直接顺序扩频（dsss）取出信号，把它“散布”到几个频率上，实质上形成了冗余的信号。
5. almost periodic differential equation 
   概周期微分方程

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• 1. 殆周期序列
  本质非负矩阵 essentially non-negative matrix...殆周期序列 essentially periodic sequence...本质正矩阵 essentially positive matrix
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