1.the profound depths of the sea; the dark unfathomed caves of ocean-Thomas Gray; unplumbed depths of the sea; remote and unsounded caverns.
深不可测的大海；海洋中幽深、黑暗的洞穴--托马斯·格雷；大海不可测量的深度；遥远、幽深的洞穴。
2.in French certain letters are often unsounded .
在法语中有些字母经常是不发音的。
3.Let my unsounded self, supposed a fool,
让我不知深浅，权充傻瓜，