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1. The nests of the swifts are often found in the trees, where they can fly freely and catch insects for food.
敏捷的巢穴通常在树上，它们可以自由地飞翔并捕捉昆虫作为食物。
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2. The swifts are known for their agile flight and their ability to dart through the air with incredible speed.
敏捷的飞行和惊人的速度是燕子们闻名的原因。
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3. In the spring, when the weather is warm, you can often see these birds flying high above the treetops, searching for food.
春天，当天气温暖时，你可以经常看到这些鸟儿飞到树梢之上，寻找食物。