德国智库ZEW：乐观情绪的提升主要体现在机械工程和金属生产行业的预期显著改善，其次是电气行业。

Group 1 - The core viewpoint of the article highlights an increase in optimism, particularly in the mechanical engineering and metal production sectors, with significant improvements in expectations [1] - The electrical industry also shows a notable rise in optimistic sentiment, although it is secondary to the mechanical engineering and metal production sectors [1]