软性的英文：
softness

Pack sth. in soft packages(or packing)
软包装(用软性材料包装)

Floppy disc: Small flexible plastic disc widely used for magnetic storage of information on micro computers.
软碟:小型软性胶碟，多用于微电脑中作贮存信息用。

Soft drug (drug not likely to cause addiction(eg marijuana)and less dangerous than a hard drug such as heroin )
软性毒品(不易使人上瘾且危害性不及海洛因之类的硬性毒品者,如大麻).

A soft breeze pulsed the air.
一阵温和的微风拨动着空气。

A soft, familiar voice answered.
那边是我熟悉而温和的声音。

A good conscience is a soft pillow
不做亏心事,不怕鬼敲门

There was a soft tapping on my door.
有人在轻轻地敲我的房门。

The room was flooded with soft light.
房间里充满了柔和的光。