Because these seeds are so little, you may need to buy a special bird feeder with smaller openings to hold it.

因为因为这些子很小，所以你需要购买一特殊的器，这器开口比较小，可以稳住子。

Next, the signal is sent to the frequency and phase comparator which wants the two signals to  be identical.

接下来，信号被发送和相位比较器，该比较器希望两个信号相同。

In the middle is a frequency and phase comparator that outputs a signal equal to the difference  between the crystal and the voltage-controlled oscillator.

中间是一个和相位比较器，它输出等于晶体和压控振荡器之间的差值的信号。

Next, an integrator takes  the output from the phase comparator and turns it into a steady voltage and uses it to  drive the voltage-controlled ring oscillator.

接下来，积分器获取相位比较器的输出并将其转换为稳定电压，并使用它来驱动压控环形振荡器。