translation.en: It's an impressive track record, and so we look back and we say, well, we didn't really exactly work this out theoretically from the start, but when we look back, there are theoretical movements in science education.
translation.zh: 这是令人影响深刻的成绩记录，所以回过来看我们说， 我们不是从理论开始的， 但我们回头看，发现有理论支持我们的科学教育。