但是，如果你仔细观察，就可以发现他们总是全副武装，并且在不停地移动。

If you look closely, however, you'll notice that they are almost always fully dressed, and that they tend to keep moving.

youdao

接下来的挑战是,想办法让这些点固定在,街上，因为,它们总是不停地移动。

Then, the next challenge was to figure out how to keep the dots on the streets because they were going all over the place.

youdao

那是一只鸽子。它咕咕地叫着并左右不停地移动。这一切都尽收我的眼底。

It was a pigeon, and it cooed and shuffled its footing, completely oblivious to my watchful eye.

youdao

Then, the next challenge was to figure out how to keep the dots on the streets because they were going all over the place.

接下来的挑战是,想办法让这些点固定在,街上，因为,它们总是不停地移动。

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