The practice spread during the 20th century, and became almost universal by the 1960s.
这一做法于20世纪散播，到了20世纪60年代就几乎遍布全球。
The disconnection between theory and practice of instructional design is universal.
教学设计理论和实践脱节问题已普遍存在。
The disconnection between theory and practice of instructional design is universal.
教学设计理论和实践脱节问题已普遍存在。
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