In this case, the time required to record the steps for all of the test cases might be unfeasible.

在此情况下，需要记录所有测试用例步骤的时间可能不能实行。

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The number of steps in a use case flow, which describes the interaction between an actor and the system, can also vary widely both across and within scenarios.

在一个用例流程里的步骤的数量，描述了角色与系统之间的关系，也能够发生很大的改变。

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However, the sequence of use case steps is often mandatory only in relation to the next interaction with an actor.

然而，用例步骤的顺序通常仅仅关系到参与者的下一个交互。

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In fact, it took the same number of steps as it did in the other case, because each time I'm cutting it down by a half.

因为每次我都把问题的规模,缩小一半，这很棒，好，接下来让我们这么做。

麻省理工公开课 - 计算机科学及编程导论课程节选

t In the b even case, again I'm going to let t of b be the number of steps I want to go through.

如果b为偶数，那么我还是要用,来代表解决这个问题需要的步骤数。

麻省理工公开课 - 计算机科学及编程导论课程节选

On the next step though, this, we get substituted by that. Right, on the next step, I'm back in the even case, it's going to take six more steps, plus t of b minus 1. Oops, sorry about that, over 2.

这一步就是偶数了，这一步会让我们得到，6+t这样的结果，因为b-1现在是偶数了,别忽略这里的细节。

麻省理工公开课 - 计算机科学及编程导论课程节选

Mr Nicklinson's solicitor, Saimo Chahl, said the next step was for the courts to examine "in great detail what the individual circumstances of the case are before authorising any steps to be taken".

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The preliminary HSBC China Manufacturing Purchasing Managers Index fell to 48.1 in June compared with a final reading of 48.4 in May, strengthening the case for further policy steps aimed at boosting China's growth.

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After all, it has a habit of making giant steps from the tiniest of changes - so tiny in this case, it was invisible to the human eye.

BBC: By Ian Hardy