1·The exercise consists of stretching and contracting the leg muscles.
此项训练包括伸展和收缩腿部肌肉。
—— 《牛津词典》
2·The wafer is a piezoelectric resonator, expanding and contracting in response to electrical voltages at a precise, extremely high frequency.
该晶片是一个压电谐振器，以精准而极高的频率对电压作出反馈，进行放大和收缩。
3·With extraordinarily acute vision, "you'd see it expanding and contracting."
用异常敏锐的眼光观察，“你会看到它放大和收缩。”
4·To make the shaft turn, the muscles work in concert, rhythmically contracting, one pair after another.
为了使传动轴转动，所有肌肉必须协调一致，一组接一组有节奏地收缩。
5·As the application heap requirements change, the GC can respond by expanding or contracting the heap.
随着应用程序程序堆需求的变化，GC可以通过扩大和收缩堆做出反应。