... 文字影象识别（text image recognition ） 移动超声波（mobile ultrasound ） 快速的稀疏逼近（fast sparse approximation） ...
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研究者通过超声波发现，23周大的胎儿即开始在睡眠时快速移动眼球。
Studies using ultrasound have shown that fetuses exhibit REM sleep as early as the 23rd week of gestation.
爱因斯坦也无法知道由盘型传感器产生的超声波振动能将空中这些玻璃微珠钳除，再在它们悬垂在空中移动时进行测量。
Nor would he have known that ultrasonic vibrations from a plate-like transducer would shake those glass beads into the air to be tweezed and measured as they moved in suspension.
胎儿同样可以检测到快动期。研究者通过超声波发现，23周大的胎儿即开始在睡眠时快速移动眼球。
Fetuses also experience REM sleep. Studies using ultrasound have shown that fetuses exhibit REM sleep as early as the 23rd week of gestation.
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