His tongue was as rough as a rasp, but even so she would not pull her hand back, not until Jaime took her by the shoulders and yanked her away from the cage.

它的舌头粗得像锉刀，但即便如此，她也没有缩手，倒是詹姆抓着她肩膀把她从笼子旁拉开。

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To test the premise, researchers designed a tray that was too heavy for a single monkey to pull into the cage.

FORBES: Primate Economics