To demonstrate, Justin, one of Pepperberg's undergraduate assistants, instructs Griffin and Alex to hop up on the work perch.

为了演示，佩珀堡的一个大学生助手贾斯廷指导格里芬和亚历克斯跳到高处工作架上去。

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You can quickly hop up to another level simply by clicking on one of the links in the breadcrumb trail.

您可以快速跳到另外一层，这只需单击浏览路径记录中的一个链接。

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You can quickly hop up to another level simply by clicking on one of the links in the breadcrumb trail.

您可以快速跳到另外一层，这只需单击浏览路径记录中的一个链接。

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