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| 脉冲分频 | |||
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| 倒数计时 | |||
| 倒计时 | |||
| 倒数; 递减计数 | |||
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| 倒数; 递减计数 | |||
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| 脉冲频率分除法 | |||
| 脉冲分频 | |||
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counting-down : 4 phrases in 4 subjects |
| Earth sciences | 1 |
| General | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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