但随着作业难度的加大，具有成长型思维模式的学生表现出了更强的毅力。
But as the work became more difficult, the students with a growth mind-set showed greater persistence.
研究人员注意到，海豚在确定答案时会很着急地按下踏板，但在难度高的测验中则表现出犹豫。
The researcher noted that the dolphin is quite eager to press the paddle when it was sure of the answer, but exhibited hesitation during difficult trials.
块度的另一方面表现在根据不同旅客的时间成本调节价格的难度。
Another aspect of lumpiness that should be noted is the difficulty of adjusting prices to different passenger time costs.
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