They will be concerned to cut back expenditure on unnecessary items.他们将会考虑削减不必要的开销。Water allotments to farmers were cut back in the drought.在干旱时期配给农民的水量减少。Overgrown deciduous shrubs can be cut back at this time of year.过...
However, the modulation - demodulation of ultraviolet and voice transmission are the key technologies.然而, 紫外光通信的 调制解调技术 以及语音传输是整个系统的关键难点.FM receiver through demodulation , the frequency signals into sound signals.调频接收机通过...