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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When I wake up in the morning before the kids, and the house is quiet, the last thing I want to do is hop on my treadmill for a vigorous workout.

每天清晨我在孩子们之前起床时，整个房子是安静的，我最不想做的事就是跳到我的跑步机上做一次充满活力的晨练。

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"I didn't want to do a film that could be lumped into the black hip- hop-shoot-em-up-gangster-drug movie, " Lee says.

CNN: Black films venture beyond ghetto violence

Seminal trip-hop group Massive Attack have teamed up with film-maker Adam Curtis to create a live show for the Manchester International Festival.

BBC: Daddy G of Massive Attack on stage

Ms. JACKIE SALLOUM (Director, "Slingshot Hip-Hop"): Growing up in this country as an Arab-American was pretty challenging when I was younger because, you know, everything I saw on television was really negative.

NPR: Rapping About Land and Identity