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| tempo di attività (The entire duration of a timeline, including forward and backward iterations. For example, a timeline programmed to play forward and then backward, once, is active for twice the specified duration--once for the forward iteration and once again for the backward iteration) | |||
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active time : 7 短语, 3 学科 |
| 一般 | 1 |
| 统计数据 | 3 |
| 通讯 | 3 |