D-value的用法和样例：
例句
- Compare the absolute value of the difference to the acceptable difference.
将差值的绝对值与可接受的差值进行比较。 - If the value of standard deviation overstepped the enacted bound, the dynamic model should be identified, and the PID parameters should be optimized again.
在系统运行过程中，不断检测航向角偏差的标准差值，若该值超出设定范围，则重新辨识模型，优化参数。
