Closure operation of binary relation plays an important role in network, parsing and detection and diagnosis of malfunction in switch circuit.

二元关系的闭包运算在网络、语法分析以及开关电路中的故障检测和诊断等领域有着重要的作用。

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Up to 60 fans fought running battles at Newbury racecourse for 15 minutes, leading to the closure of bars around the circuit and police being called.

BBC: Cardiff and Swansea football fans clash at Newbury race

Best Buy, which competes with leading retailers like Wal-Mart, Costco and RadioShack, is benefiting from the closure of its closest competitor Circuit City, giving the company an opportunity to grab market share.

FORBES: Best Buy Needs To Crank Out Sales To Justify Stock Price