名词
中文翻译：雨燕
同义词：
['swallow', 'swallow', 'swift', 'swiftly']
例句：
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1. The swallows are flying overhead in the spring.
燕子们在春天飞过头顶。
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2. She watched the swallows as they flew over the lake.
她看着燕子们飞过湖面。
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3. The swallows were busy collecting insects for their winter diet.
燕子们忙着收集昆虫准备过冬。