这些鸟很难观察，因为它们生活在山区森林里，所以研究人员在一些鸟的尾巴上安装了微型摄像机，以此作为一种研究它们行为的方法。
The birds are hard to observe, as they live in a region of mountainous forest, so the researchers have attached tiny cameras to the tails of some birds, as one method of investigating their behaviour.
他们用摄像机从几英里外观察美洲虎。
They use video cameras to watch the jaguars from several miles away.
可以在模拟器客户机中观察和分析这一活动。
You can observe and analyze this activity in the Simulator Client.
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