phase lock-in detecting锁相检测
digital phase lock-in数字锁相
phase lock-in amplifying锁相放大
phase lock-in amplifier锁相放大电路
Dual phase lock-in amplifier双锁相放大器
phase-in depth进相深度
phase-in period准备阶段
Phase-in substance分阶段物质
PHRASAL VERB（动词词组） If a new way of doing something is phased in, it is introduced gradually. 逐步采用
The reforms would be phased in over three years.
改革将在3年内逐步实施。