additional phase difference的用法和样例：
- The phase difference between the two sources is gradually drifting with time.
- In practice there are three methods of accomplishing this phase difference.
- Research on Subdividing Method for Random Phase Difference Fringe Signals[J].
- M/G/1 retrial queue with loss of arrival, additional phase of service and feedback is considered.
- An M/G/1 retrial queue with additional phase of service and feedback is considered.