phase-in depth进相深度
phase separation in glasses玻璃分相
Phase error in aperture口面相差
phase-in period准备阶段
Phase is in love第一阶段是在爱;阶段是在爱中
Phase-in substance分阶段物质
phase opposite in反相
phase transition in traffic交通相变
phase lock in circuit锁相环路
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。