1·The team then took a fundamental tone pitched below 5 kHz and digitally filtered it to leave just the overtones above 6 kHz.
研究小组接着选取一个音调低于5千赫兹的基本音，滤掉低于6千赫兹的所有声音。
2·It began with a study one of them did on a dolphin, who had been trained to recognize a particular high-pitched tone.
首先，他们中的一个人对海豚做了一项研究，训练它识别一种特殊的高音。
3·Be careful about the tone of your voice. Keep it evenly moderated and avoid getting a high-pitched, whiny or tearful tone.
对自己的语调要十分小心。使它保持均匀地…避免高嗓门、牢骚或哭腔。
4·I knew that the tone of her voice would be our answer: a soft and solemn tone would indicate that life goes on as usual, and a high pitched girly scream would mean our life would change forever.
我知道她说话的声调就会代表着比赛结果：低沉而严肃的声音，代表着生活还要照常继续；高昂而惊喜的尖叫，就意味着我们的生活可能会从此改变！
5·We should use a moderate tone of voice, and avoid speaking in a sharp, high-pitched voice, which gives people the feeling that we are showing off or arguing.
尤其要避免用尖锐拔高的音调讲话，令人感觉你在卖弄本事或争论。