softly

The mother sang softly to her baby to help him fall into a deep sleep.

(Chinese) 母亲对着婴儿轻声歌唱，帮他进入深度睡眠。

She spoke softly into the phone so as not to wake up her sleeping roommate.

(Chinese) 她在电话里轻声细语，以免吵醒正在睡觉的室友。