1·One of them is Spire, a stonelike device that clips to a belt or bra and senses the expansion and contraction of the chest cavity during breathing.
Spire就是其中之一。这种小装置零售价为149.95美元，形状好像一块石头，可以别在皮带上或卡在文胸上，感知呼吸时胸腔的扩张和收缩。