三言
两语
1. Even if polluted air does not kill us, it can make us very sick.
2. Then they can record their movements, or migrations (迁徙)．
3. Scientists do not know if the attacks are the result of anger or interest.
1. 被大自然的美所吸引，我们情不自禁地拍了许多照片。
Attracted by the nature's beauty, we couldn't help taking lots of pictures.
2. 一些研究表明，在树林中散步使我们放松。
According to some studies, walking among trees makes us relaxed.
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