中国5月非制造业PMI 50.3，预期50.5，前值50.4。

Group 1 - The core point of the article is that China's non-manufacturing PMI for May is reported at 50.3, which is below the expected 50.5 and slightly lower than the previous value of 50.4 [1] Group 2 - The non-manufacturing PMI figure indicates a slowdown in the services sector, as a reading above 50 indicates expansion while below 50 indicates contraction [1] - The slight decline from the previous month suggests potential challenges in the non-manufacturing sector, which could impact overall economic growth [1] - The data reflects ongoing economic conditions and may influence investor sentiment regarding the Chinese economy [1]