| 单词 | 封闭性 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔housing〕An enclosing frame in which a shaft revolves.外套，外罩：封闭性的框架，有轴在里面转动美国传统〔perimeter〕A closed curve bounding a plane area.周界：围绕一平面域的封闭性边界美国传统〔urn〕A closed metal vessel having a spigot and used for warming or serving tea or coffee.壶：一种封闭性的金属容器，一般带有塞子，用于加热或冲泡茶、咖啡美国传统〔vivarium〕A place, especially an indoor enclosure, for keeping and raising living animals and plants under natural conditions for observation or research.动物园，植物园：尤指户外的封闭性场所，用于在自然条件下饲养观察和研究用的存活动物和植物美国传统 |
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