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1·The prefix tree adder is useful in compound adder implementation. It is preferred over the ripple carry adder and the carry lookahead adder.

该加法器适用于复合型加法运算，优于脉动进位加法器和超前进位加法器。

2·A fast carry-skip adder is proposed based on variable-sized two-level block carry-lookahead logic.

提出了一种基于方块超前进位的快速进位跳跃加法器。