按照数学家们的分类，三叶形是最简单的纽结。 所谓纽结，它是三维空间中不与自己相交的封闭曲线，或者说是三维空间中与圆周同胚的图形。
The trefoil is the simplest knot in mathematicians' classification.
伦敦证券交易市场过去是一个封闭的市场，令人垢病的是其过时的分类：进行交易的股票经纪人和负责做市的股票做市商。
The London stock exchange was a closed shop, marked by an antiquated division between brokers who brought the business and jobbers who made markets in shares.
一种拥有封闭车体及特殊动力设备的大型车辆，用来对垃圾进行装载、压缩和分类等工作。
A large vehicle with an enclosed body having special power-driven equipment for loading, compressing, and distributing wastes within the body.
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