降压的英文：
decompression
underpressure
reduction voltage
step-down

参考例句：

A step-down transformer has a turns ratio less than 1
降压变压器的匝数比小于1。

The hypertension-relieving pillow is a new member of the health world.
降压保健枕，保健天地又一族。

decompression是什么意思：
n. 减压

In this installment I am going to talk about a particular part of the packer, the decompression stub.
这一部分我将讨论加壳程序的一个具体部分：解压程序段。

Pack: To compress and store data in a magnetic storage medium so as to save storage space. Unpack refers to decompressing.
密装:把数据压缩及贮存于磁体贮存媒介内以节省贮存空间。解开密装是把压缩的数据还原的意思。

I'm now finding I really need weekends away from technology to decompress and recover.
现在我确实需要利用周末以逃出科技的包围，从而进行自我减压和自我恢复。

underpressure是什么意思：
低压,抽空,真空计压力,欠压,稀薄,压力不足,降压
reduction是什么意思：
n. 减少；缩小；降低；简化；还原（作用）

This is a reduction procedure.
这是个简化方案。

A drive for cost reduction is announced.
宣布开展降低成本的竞赛。

The major reason for the reduction of family size is a reduction in the number of births.
家庭规模缩小的主要原因是生育子女数量的减少。