名词
中文翻译：燕子
同义词：
['swift', 'swallow']
例句：
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1.The swiftlet is a small bird that can fly very quickly.
燕子是一种能飞得很快的小鸟。
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2.The swiftlet has a distinctive black and white plumage.
燕子有独特的黑白羽毛。
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3. In the spring, swiftlets gather in large flocks to migrate south for the winter.
春天，燕子成群结队地迁徙到南方过冬。