Double check

In chess, a double check is a check delivered by two pieces simultaneously. In chess notation, it is almost always represented the same way as a single check ("+"), but is sometimes symbolized by "++" (however, "++" is also sometimes used to denote checkmate).

单词	Doublecheck
释义	Doublecheck 原声例句经济学人（汇总） Why is football so far behind other sports like rugby, cricket and tennis in using technology to doublecheck refereeing decisions? 为什么在运用技术来检验裁判的准确性上，足球远远落后与其他运动，比如英式橄榄球，板球或是网球？英语百科 Double check In chess, a double check is a check delivered by two pieces simultaneously. In chess notation, it is almost always represented the same way as a single check ("+"), but is sometimes symbolized by "++" (however, "++" is also sometimes used to denote checkmate).
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Doublecheck

Double check