Domain models can be used to assist learners on any individual problem, but they’re insufficient for helping learners move through a whole curriculum because they don’t track any progress over time.

领域模型可用于帮助学习者解决任何个别问题，但它们不足以帮助学习者完成整个课程，因为它们不会随着时间的推移跟踪任何进展。