One basic part of ocean study is understanding waves and how they work.
海洋研究的一个基本部分是了解海浪及其规律。
A fuller understanding of the propagation of sound waves had to wait until more elaborate mathematical techniques were developed.
对声波传播的进一步了解必须要等到更精密的数学技术开发出来。
Don't they realize that if someone is smart enough to read a text, they're also capable of understanding what the little bobble head with the sound waves coming out of him symbolizes?
为什么有些人觉得有必要发信息,告诉你他们刚留了言?难道他们没有意识到,如果有人有足够的智力阅读信息的话,他们也能明白,耳塞里传出来的声波代表着什么?
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