很重要的是要注意，如果估计中不存在偏置，那么有可能是一半估算值高，一半低。
It is important to note that if there is no bias in the estimates, then half of the estimates are high and half are low.
项目估算工具根据可用信息提供工作及持续时间的估计。
Project estimation tools provide estimates of effort and duration based on the available information.
但拆解并没有计入设计，软件，生产和运输的成本。这样的开销估算填补了对每一台售出设备的利润估计的空白。
And while a teardown doesn't account for the costs of design, software, manufacturing, or shipping, these cost estimates help fill in the blanks toward estimating the profit on each device sold.
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