Scientists have set up two security fences at each of Assam state's breeding centers.

科学家们已经在阿萨姆邦的每个繁育中心设置了两个安全围栏。

These were: the  Orange Free State, centered around the Orange River, and the Transvaal Republic, beyond the  River Vaal.

它们是：以奥兰治河为中心的奥兰治自由邦，以及瓦尔河以外的德兰士瓦共和国。

Scientists have set up two security fences at each of Assam state's breeding centers. No visitors are permitted, and cars cannot be left at the centers.

科学家们已经在阿萨姆邦的每个繁殖中心设置了两道安全围栏。访客不得入内，车辆不得在中心逗留。