The newly developed bidding CARDS and special CARDS are made of foreign-built plastic materials that are high in strength and elasticity, not easy to break in winter time and washable in water.

新开发的塑料叫牌卡、塑料专用牌均采用进口塑料片材，据有强度高、弹性好，在冬天使用不易破裂也可在水中清洗。

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If selling a company, never open the bidding, as that reveals your cards.

FORBES: Making a Killing

But a battle could be on the cards, since Harmony Gold is thought to be bidding for some of the same mines, although it has yet to say more than that it is in talks with a third party.

BBC: Business crosses the line in South Africa

"The bidding procedures are designed to allow bidders to give us their best offers without fear of showing their cards to competitors, " said the firm's chief intellectual property officer, Timothy Lynch.

BBC: Kodak printer