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- Evaporation influenced the soil water distribution mainly in the upper soil layer at the initial stages of irrigation. Less irrigation frequency would lead to greater uneven water distribution. 蒸发和灌水频率对风干土壤中水分分布的影响表现为：1)有、无蒸发条件下土壤水分差异在灌水初期主要体现在上部土层，此时，灌水频率越低，此区水分差异越大；
- Experimental results indicated that the lower soil moisture tension practiced by increasing irrigation frequency, resulted in higher fruit yield, number of fruiting cladodes and flowers. 田间试验结果显示，土壤水分境况对红龙果全年总产量、结果枝数及开花数有显著影响。
- We used the money to set up an irrigation project. 我们把钱用在兴建灌溉工程上了。
- They are digging irrigation ditches. 他们在挖灌溉渠。
- He varied the transmission frequency. 他变换了无线电传送的频率。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- Study on Effects of Irrigation Frequency on Moisture and Salt Regime and Growth of Cotton Under Mulch-film Drip Irrigation 灌水频率对膜下滴灌土壤水盐分布和棉花生长的影响研究
- Irrigation is needed to make crops grow in dry regions. 干旱地区需要灌溉才能使作物生长。
- Irrigation is needed to make crops grow in dry area. 要使庄稼在乾旱地区生长就需灌溉。
- Irrigation is needed to make crops grow in dry areas. 要使庄稼在乾旱地区生长就需灌溉。
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- Water is channelled through a series of irrigation canals. 把水引入一系列灌溉渠中。
- We can often correlate age with frequency of illness. 年龄的大小往往与发病率有关。
- Accidents on that highway are happening with increasing frequency. 那条高速公路上车祸发生得越来越频繁。
- This irrigation canal has fallen into disuse. 这条渠荒废了。
- Portable irrigation is on the increase. 移动式灌溉正在增加。
- The terrace channels are convenient for irrigation. 梯田的沟渠便于灌溉。
- He tuned his radio to the police frequency. 他把无线电调到警方的频率。
- If not well managed, irrigation can be harmful. 如果管理不善，灌溉还可能有害处。
- Trickle irrigation conservers water where limited. 滴灌在水少的地方应用起来可省水。
