打包票

The sole clue of anything out of the ordinary is the unfamiliar whir of a compressor—a noise that Berretta vows company engineers will soon muffle.

要说有任何不寻常之处，唯一的线索，就是压缩出罕有的「赫…赫…」声。贝雷塔打包票，原厂工程师一很快让这怪声消失。