| 单词 | difficultness |
| 例句 | This excellent showing for the control series wholly justifies the comparison of problems 2 and 3 as to difficultness, made above. The Mental Life of Monkeys and Apes A Study of Ideational Behavior Clearly, then, our ignorance is due not to lack of appreciation of the scientific value of primate research but instead to its difficultness and costliness. The Mental Life of Monkeys and Apes A Study of Ideational Behavior One of the chief advantages of this new method is the possibility of obtaining curves of learning for the solution or attempted solution of relational problems of varying difficultness. The Mental Life of Monkeys and Apes A Study of Ideational Behavior The difficultness of the daily tasks appears to be reliably indicated by the tendency to yawn. The Mental Life of Monkeys and Apes A Study of Ideational Behavior |
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