地虽然不能抵挡所有频率，但它能抵挡低频电波，包括无线电波，单单赤足便能达到以上效果。
Not that the earth blocks all that but the earth blocks the low-frequency stuff for sure, including radio waves and that can be brought into you just by being barefoot.
通过变频器驱动风机，让变频器运行在低频率下，起到了很好的节能效果。
The inverter runs at low frequency when driving fan can play a very good effect at saving energy.
对燃煤超细颗粒物在低频率高强度声场中团聚清除效果进行了实验研究。
The removal of ultrafine particles in coal-fired fumes was studied experimentally based on lower frequency and higher intensity acoustic field.
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