| Schedule of disaggregates revenue |
| | | | | | | | | For the six months ended June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US$ | Revenue by services line | | | | | | | Adult education supporting services | | 5,671,628 | | 5,074,720 | | 747,921 | Safety technology training services | | 3,503,890 | | 2,290,080 | | 337,516 | Online course services | | 208,072 | | 66,081 | | 9,740 | Customized equipment | | — | | 843,337 | | 124,292 | Total revenue | | 9,383,590 | | 8,274,218 | | 1,219,469 |
| | | | | | | | | For the six months ended June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US$ | Revenue by recognition method | | | | | | | Revenue recognized over time | | 9,175,518 | | 8,208,137 | | 1,209,729 | Revenue recognized at a point in time | | 208,072 | | 66,081 | | 9,740 | Total revenue | | 9,383,590 | | 8,274,218 | | 1,219,469 |
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