STC is a set of popular textbook among some science textbooks written for primary school under the direction of NSES in America.
美国在《国家科学教育标准》的指导下编写了几套小学科学教材,STC就是其中比较流行的一套。
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During China's transition from centrally planned economy to market economy, one remarkable feature is the quick development of non-state enterprises (NSEs) outside of the planning system.