The tradeoffs between average speed of answer, service level, occupancy, telecom requirements and staff requirements.
平均应答时长，服务水平，占用率，中继线需求和员工需求之间的平衡；
The answer is that speed comes at the price of flexibility.
答案是，速度的获得以灵活性的失去为代价。
If your answer is yes, then you are wrong again. All we can be certain of is that the relative speed between the two trains changed.
如果你回答说是的，那么你就又错了。我们所能够完全肯定的一点只是这两列火车之间的相对速度变了。
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