standard half-cell

例句：

1. 1.The standard for measuring the length of a rod is its length divided by its own length.
   测量杆长度的标准是其自身长度除以自身长度。
2. 2. The standard operating procedure for this task is to follow the instructions step-by-step.
   完成此任务的标准操作程序是按照步骤一步步进行。
3. 3.The standard deviation measures how much data points deviate from the mean.
   标准差衡量的是数据点与平均值的偏离程度。