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频率调制信号的大致带宽公式
The approximate bandwidth of FM signal is:

$B_{FM} = 2B_{m}(1 + R_{d})= 2(B_{m} + f_{d})$ . (乘以2是因为频率调制信号一般包含了上下两个侧边带)

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

No repetitions

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