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| 81. | busy indicating circuit |
| 示忙电路 |
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| 82. | busy hour calls |
| 忙时呼叫 |
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| 83. | busy in packing |
| 忙着收拾东西 |
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| 84. | group busy signal |
| 群占线信号 |
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| 85. | busy period distribution |
| 忙期分布 |
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| 86. | busy idle condition |
| 忙闲条件 |
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| 87. | exchange busy hour |
| 电话局忙时 |
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| 88. | a busy morning |
| 忙碌的早晨 |
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| 89. | local busy condition |
| 市话占线 |
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| 90. | Anxious and Busy |
| 汲汲忙忙 |
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