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Kyle Cassidy and three other members of the Annenberg Running Group were stretching on the grounds of the University of Pennsylvania, waiting for a few latecomers. The Penn colleagues and other community members meet three days a week for a roughly 30-minute jog and an occasional lecture. That's right― during some runs, one of them delivers a talk. Topics range from the brain to Bitcoin.

But on this day last January, it would not be their normal run. The first clue that something was off was the man who sprinted past them. "Running at an amazing pace," Cassidy told Runner's World admiringly. Cassidy discovered why the sprinter was so fleet of foot when another man ran by, yelling, “Help! He took my phone and laptop!"

At that, the group did what running clubs do: They ran, trailing the suspect down the streets of Philadelphia until he ducked into a construction site. The runners split up. Cassidy ran around to the far side of the site to cut the thief off while the others wandered the neighborhood hoping he had dumped the loot （赃物）in a backyard.

No luck. So they decided to ask residents whether they'd seen the guy. When they knocked on the door of one row house, they were in for a surprise. Unknown to them, he had already emerged from the construction site—and was hiding behind a bush by that very house. As the owner opened the door, the suspect darted out from behind the bush ... and right into the arms of campus police, who'd joined the chase shortly behind the runners.

The members of this running group are not hard-core athletes. But they do understand the benefit of a little exercise. ''Running is typically a useless sport where you turn fat cells into heat," Cassidy told The Philadelphia Inquirer. "But occasionally it can be useful, and here was one of those opportunities."

凯尔·卡西迪(Kyle Cassidy)和安嫩伯格跑步小组的其他三名成员正在宾夕法尼亚大学的操场上伸展身体，等待几个迟到的人。宾夕法尼亚大学的同事和其他社区成员每周聚会三天，进行大约30分钟的慢跑和偶尔的讲座。没错，在一些跑步过程中，他们中的一个会发表演讲。话题从大脑到比特币。

但在去年1月的今天，这不是他们的正常运行。事情不对劲的第一个线索是那个从他们身边飞奔而过的人。“以惊人的速度跑步，”卡西迪钦佩地告诉《跑者世界》。卡西迪发现了为什么当另一个男人跑过来大喊“救命!他拿走了我的手机和笔记本电脑!”

听到这里，这群人做了跑步俱乐部会做的事:他们跑着，在费城的街道上跟踪嫌疑人，直到他躲进一个建筑工地。赛跑者分开了。卡西迪跑到现场的另一边阻止小偷，而其他人则在附近徘徊，希望他把赃物扔在后院(赃)。

没有运气。所以他们决定询问当地居民是否见过这个人。当他们敲开一排房子的门时，他们大吃一惊。他们不知道的是，他已经从建筑工地出来了——就藏在那所房子旁边的灌木丛后面。当主人打开门时，嫌疑犯从灌木丛后面窜了出来。并直接进入了校园警察的怀抱，他们紧随其后加入了追捕行动。

这个跑步小组的成员不是核心运动员。但他们确实明白一点运动的好处。卡西迪告诉《费城问询报》:“跑步是一项典型的无用运动，你把脂肪细胞转化为热量。”“但偶尔也会有用，这就是其中一个机会。”

句子成分分析：

Kyle Cassidy and three other members (of the Annenberg Running Group) were stretching [on the grounds (of the University 

of Pennsylvania)], waiting for a few latecomers.

句子语法结构详解：

* Running 为现在分词，作后置定语。
* stretching 为谓语，采用一般过去进行时。
* waiting 为现在分词，作状语。
* were 为助动词。the 为定冠词。

句子相关词汇解释：

Phrase:

Vocabulary:

句子成分分析：

Cassidy ran around [to the far side (of the site)] to cut the thief off || while the others wandered the neighborhood 

hoping | he had dumped the loot (赃物) in a backyard.

句子语法结构详解：

(ran 为 run 的过去式。)

* ran 为谓语，采用一般过去时。
* to cut 为不定式，作状语。
* off 为副词作宾语补足语(即构成复合宾语)。
* while 为连词，引导状语从句。
* wandered 为谓语，采用一般过去时。
* hoping 为现在分词，作状语。
* he 开头为宾语从句，引导词 that 被省略。
* dumped 为谓语，采用过去完成时。
* he 为人称代词主格。other 为不定代词。had 为助动词。the 为定冠词。a 为不定冠词。

句子相关词汇解释：

Phrase:

Vocabulary:

句子成分分析：

["But occasionally] it can be useful, || and [here] was one (of those opportunities)."

句子语法结构详解：

* be 为系动词作谓语。
* useful 为形容词作表语。
* and 为并列连词，连接并列句。
* here 引导倒装句。
* was 为谓语，采用一般过去时。
* can 为情态动词。

句子相关词汇解释：

Vocabulary:

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