1948年，3M发起了15％的计划，其中15％的员工时间用于创新。

1948年，3M发起了15％的计划，其中15％的员工时间用于创新。

Results (English) 1:

In 1948, 3M launched a 15% plan, of which 15% of employee time was spent on innovation.

Results (English) 2:

In 1948, 3M launched a 15% program, 15% of which spent time on innovation.

Results (English) 3:

In 1948, 3M launched 15% of its programs, of which 15% of its employees spent their time on innovation.