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。
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.
但是目前国内广泛使用的X射线机的点片曝光装置还存在自动化程度低、控制精度差、曝光精度低以及体积大等缺点。