Echosounding
音响测深法
🗣️ 情景例句
You should use 'officer' to address a policeman.
你应该用 'officer' 来称呼警察。
The worth of a thing is best known by the want of it.
物以稀为贵。
and no child born into one on the opposite side of the globe can ever achieve the thousandth part.
在地球的另一边，诞生在另一个社团的孩子与他就很少有相同的风俗。