A single stipendiary magistrate or three lay magistrates sit in the magistrates 'court.

裁判法院由一个领薪裁判官或三个非专业裁判官列席。

In order to try a case there must be at least two lay (non-lawyer) magistrates, or a stipendiary magistrate.

要审理一个案件必须至少有两名非法律专业治安法官，或者一名领薪治安法官方可进行。

Now here is a quick answer for this difference: It is because the evaluation system and policy of stipendiary (salary).

现在是一个直接的答案(意思就是不再具体分析他们的实际政策了)。