soft的變化: softness，soften
He spoke with surprising softness .講起話來，卻出人意外地細聲細氣。
The softness of the earth gave him an idea .軟塌塌的地面啓發了他的靈感。
He played softly when the music called for softness .在音樂需要輕柔時，他也會柔和地演奏。
Softness can overcome strength .柔能克剛。
Plastic can be softened by proper heating.
塑料適當加熱就可以軟化。
