一种采用“微小原子云”技术的迷你磁场传感器，第一次成功地跟踪到了人类的心跳。
A miniature magnetic sensor using a tiny cloud of atoms has successfully tracked a human heartbeat for the first time.
小组发现，在磁场之中，原子的方向以特殊的方式发生的变化，而这种变化可以被穿过原子云的光束探测到。
In the presence of a magnetic field, the atoms' orientation changed in a particular way, and this change was detectable in the light that came through the atom cloud, the team found.
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