B. Hardness Hardness is the dog's ability to recuperate from a disagreeable experience.

强硬度硬度是指狗从不愉快经验中恢复的能力。

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B. Hardness Hardness is the dog's ability to recuperate from a disagreeable experience.

强硬度硬度是指狗从不愉快经验中恢复的能力。

youdao