frequency difference in roll 滚转振动频率
The second key to breathing with high frequency and high efficiency lies in how you roll to the side to take that breath.
呼吸时保持高频率以及高效率的第二要义，取决于你如何转体至呼吸侧。
Voltage controlled crystal oscillator (VCXO) plays an important roll in the atomic frequency standard.
压控晶体振荡器是原子频标的重要组成部分。
Each time she moved up in vibration, the weekend with her son would cause her to roll back in frequency and become ill.
每次她提高振动，但到周末和她儿子呆一起时就导致她频率回跌而生病。
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