许多动物都用超声波来进行侦查，有些动物还能发出非常高频的声音。
Ultrasound is used by many animals that detect and some of them send out very high frequency sounds.
它振动得越快，发出的声音频率就越高。
The quicker it vibrates, the greater the frequency of sound it produces.
蝌蚪通过将空气推出肺部来发出声音。
The tadpoles produce the sound by pushing air out of their lungs.
十二周大时，婴儿会微笑，发出类似元音的声音。
动物园为保存和保护环境发出了关键的声音。
Zoos provide a critical voice for conservation and environmental protection.
你记得它的用途或者当老师在黑板上写字时它发出的声音吗？
Are you remembering what it is used for, or the sound it makes when the teacher writes on the blackboard?
这些障碍可能包括无法发出某些声音，讲话节奏和流畅度有问题，以及语音障碍。
These disorders can include the inability to produce certain sounds, speech rhythm and fluency problems, and voice disorders.
这个婴儿尖叫着发出喔啊的声音，阿比盖尔则咿呀儿语。
The baby squealed and made cooing noises, while Abigail talked her baby talk.
金属容器开始发出咔嗒咔嗒的声音。
我们漫步走过发出清脆声音的喷泉和香气四溢的花园。
那蛇蠕动着，发出嘶嘶的声音。
机器零件摩擦发出刺耳的声音。
雪在脚下发出嘎吱嘎吱的声音。
铁锹撞在什么金属物件上发出刺耳的声音。
她吃苹果发出嘎嚓嘎嚓的声音。
蛇陷入绝境时会发出咝咝呼呼的声音。
蒸汽管突然发出咯咯的声音，弗兰克林吓得跳了起来。
The steam pipes rattled suddenly, and Franklin jumped with fright.
毒蛇在无法逃脱时会发出愤怒的呼呼咝咝的声音。
爱丽丝刚要发火，帽商和三月兔就发出“嘘”的声音！
Alice was beginning very angrily, but the Hatter and the March Hare went "Sh!"
农夫掐了一下乌鸦的头，结果乌鸦叫了起来，发出了呱呱的声音。
The peasant pinched the raven's head, so that he croaked and made a noise like krr, krr.
无论你被捆绑到什么程度，通常你都可以发出某种声音，比如咕噜声。
No matter how bound up you are, you can usually make some sort of noise, like a grunt.
没有人能肯定地说，这声音是从他的脑袋里发出来的呢，还是从空树里发出来的呢？
Whether the sound came from his head or from the hollow tree, that no one could say with certainty.
海豚实际上会发出两种声音。
我们知道像狗这样的哺乳动物会发出很多不同的声音。
We know that mammals, dogs for example, dogs vocalize many different sounds.
听起来像是——像是猪发出的声音。
狼叫是男人发出的声音，这个声音表示他喜欢女人的外貌。
A wolf call is the noise made by a man to show that he likes the way a woman looks.
为了避免引起怀疑，他示意他们不要发出任何钦佩的声音。
He signed to them not to give vent to any cry of admiration that might rouse suspicion.
如果你不发出声音，主人会认为你不喜欢这样的食品而感到生气。
If you do not slurp, then your host will think that you do not like your food and will take offense.
人们发现，这些声音是由海豚充满空气的鼻囊发出的。
These sounds, it has been found, are produced in the air-filled nasal sacs of the dolphin.
这些声音包括冰原破碎、水下地震和动物自己发出的声音。
These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
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