他们所采用的技巧包括给婴儿的父母一张存有大脑扫描仪发出的声音的CD，并让他们在家中播放。
Techniques used included giving their parents a CD to take home with the noise made by the machines.
他们所采用的技巧包括给婴儿的父母一张存有大脑扫描仪收回的声响的CD，并让他们在家中播放。
Techniques used included giving their parents a CD to take home with the noise made by the machines.
他们所采用的技巧包括给婴儿的父母一张存有大脑扫描仪发出的声音的CD，并让他们在家中播放。
Techniques used included giving their parents aCD to take home with the noise made by the machines.
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