名词
中文翻译：栅栏环
同义词：
['barrier ring', 'fence ring']
例句：
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1.The palisade ring is made of wood and stands about six feet tall.
这个栅栏环由木头制成，大约有六英尺高。
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2. The palisade ring was used to keep the animals in their pens.
这个栅栏环用来把动物关在围栏里。
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3.The palisade ring was a popular design for medieval castles.
这个栅栏环是中世纪城堡中常见的设计。