基线漂移: base line driftbase line wanderbaseline driftbaseline shiftbaseline wander (blw)
定期: 1.(定下日期) fix [set] a date2.(有一定期限的) regular; at regular intervals; periodical 短语和例子定期报告工作制度 system of regular work reports; 定期汇报工作 regularly report back on one's work; 定期轮换 rotate at regul