All through the thundering waves of winter, the ships have pressed on across the Indian Ocean, pulsing out sonar signals.

尽管冬天波涛汹涌，船只依旧在印度洋上航行搜寻声呐信号。

The Brygmophyseter sends a sonar signal for help, a blast of sound similar in range to a World War 2 submarine.

四贺鲸发出声纳信号求救，一阵音域上与第二次世界大战用的潜艇相似的声音。

She sends out sonar signals through the water, just as whales do.

她像鲸鱼一样通过水发出声纳信号。