双限继电器包含两个比较器和一个电位器，在一个单一的机电继电器下运行。

Dual limit relays contain two comparators and potentiometers operating into a single electro - mechanical relay.

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南家再叫2S，这是所谓的超转移，承诺有四张红心支持，高限牌力，通常是有个双张。

South rebid two spades, a so-called superaccept promising four-card heart support, a maximum and, typically, a doubleton somewhere.

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最后，讨论了综合双侧规格限情形的接收准则及图解法。

Finally, the acceptability criterion and its graphical method for the case with combined double specification limits are discussed.

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