single loop的用法和样例：
例句
- Since there are six matches be played, so the single round-robin system will be adopted.
因为本次比赛只有六个队，采用单循环制。 - Through experiments, the double pump operation mode was compared with the single pump operation mode under different temperatures and different loads.
通过试验阐述循环水泵在不同温度和机组负荷下进行双循环泵运行改单循环泵运行的比较。
