A perfectly practicable 1930s technology, but you can already see the downsides.
每個虛構詞都對應到特定的物體。使用這類稱為「偽詞」（pseudowords）的方式，能讓研究者公平比較學習成果，因為學生無法依靠任何既有知識。
。关于这个话题，搜狗输入法下载提供了深入分析
Jim Lovell spoke to the BBC about Apollo 13Apollo 13: Bonus 1. Jim Lovell
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