Water saving techniques include spray irrigation, micro irrigation, channelleakage prevention, low pressure pipe transport of water, reform of field irrigation, and so on.
节水技术包括：喷灌、微灌、渠道防渗、低压管道输水、田间灌水技术改进等。
2
At the same time, the channel estimation error, caused by the spectral leakage of DFT, can be reduced by canceling the auto-correlation error of the time-domain sequence of frequency-domain pilots.
同时，通过消除频域导频时域序列的自相关误差，能有效降低由DFT谱泄漏导致的信道估计误差。
3
The attenuation measurement error due to RF leakage in a single channel and a dual channel microwave attenuation measurement system is investigated.