他是一位出色的成本压缩专家，总能将开销降至最低。

He is an excellent ___minimizer of expenses, always reducing costs to the lowest possible level.

这个优化算法作为成本函数的最小化器非常有效。

This optimization algorithm works as an effective ___minimizer for the cost function.

这种新型噪音消除器是一个高效的噪音降低装置。

This new noise eliminator is an effective sound ___minimizer.