婴儿皮肤的柔软度令人难以置信。

The ___softness of the baby's skin is incredible.

年复一年，这把旧扶手椅已经失去了它的柔软度。

Over the years, the old armchair has lost its ___softness.

当她对孩子说话时，声音里有一种明显的柔和。

There was a noticeable ___softness in her voice when she spoke to the child.