... demanding test要求高的测验 difficult test难度高的测验 easy test容易的测验 ...
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难度逐步提高的测验 scaled test
难度高的测验
A difficult test
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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