However, widespread and successful use of the device required a unified system of telegraph stations among which information could be transmitted.
然而，电报设备要想广泛、成功的使用，这就要求电报站有统一的系统以保证信息的传送。
2
However, the film exposure device of the currently widespread-used X-ray machine has poor quality of image, a low level of automation, poor precision controlled and film exposure and large size.