Their yawning seems to have nothing to do with sleepiness or boredom—quite the reverse—but it does precede a change in activity level.

他们打哈欠似乎与困倦或者无聊没有任何关系，但恰恰相反，打哈欠这一行为的确出现在了活动水平的变化之前。

The empirical evidence, such as it is, suggests an altogether different function for yawning—namely, that yawning prepares us for a change in activity level.

很多实验证据证实了打哈欠的另一个不同的功能，它能让我们做好准备，改变活动状态。

It has a budding community growing in activity.

它有一个正在成长的萌芽社区。

Find Alan's report card in activity 2b on page 29.

在第29页的2b中找出艾伦的报告单。

Actions in activity diagrams and attributes of actions.

活动图表中的活动以及活动的属性。

The team found differences in activity and anxiety levels.

这支队伍发现了不同程度的活性与焦虑。

"Represents" attribute of object node in activity diagram.

活动图表中对象节点的“Represents”属性。

Object nodes in activity diagrams along with "State" attributes.

活动图表中与“状态”属性一道的Object节点。

Control flows and initial flows between actions in activity diagrams.

活动图表中操作之间的操作流程以及初始流程。

Even small increases in activity improved the odds of staving off the disease.

即使是小量增加活动也能改善削减癌症的机会。

Such differences in activity and anatomy, though, must have deeper causes.

这种活性和解剖学上的差异肯定有更深层次的原因。

2b Listen again.Match the requests in activity 2a with the responses below.

再听一遍，把2a中的要求同下面的回答联系起来

By contrast, boys in the same situation show no such increase in activity in these areas.

相比之下，男孩在同样的情形时这些区域活动表现的没有这样活跃。

Retrenchment by companies is a more likely culprit for the more recent drop in activity.

公司规模的消减更有可能是最近经济衰退的罪魁祸首。

In activity form, you capture the decision conditions as post-conditions of the output criteria.

在活动形式中，决策条件将被捕获为输出条件的后置条件。

A modest increase in activity can lead to better overall health, fitness, and quality of life.

适度的增加运动会带来更好的全面的健康和长寿。

But you, dear reader, are indulging right now in activity that is equally as polluting as air travel: using a computer.

但是你，我敬爱的读者，正放纵于一项与空中旅行造成同等污染的活动：使用电脑。

Any bounce in activity from a turnaround in the stock cycle will be short-lived if underlying demand fails to revive.

如果基础需求没有重新增加，任何来源于股票周期突然上扬的反弹都会是短期的。

But there were a record 26 Predator drone attacks last month, a spike in activity that suggests something is going on.

但是有一份记录表明26名袭击者在上个月发动了袭击，这次袭击如一根利刺，好像暗示着有什么事情将要发生。

For inactive children and youth, a progressive increase in activity to eventually achieve the target shown above is recommended.

对缺乏身体活动的儿童和青少年，建议采取渐进的方式增加身体活动量，最终达到上述的推荐量。