前期工作
Preliminary work
Activities in the early stage of project
prophase work
Work in Early Phase
earlier stage works
earlier stage work
prior work
preparation work
early-stage work
preparatory work
pre-project tasks
Front-stage Work
pre-phase work
pre-stage work
Initial work
primary studies
antecedent work
preparat ion work
prior period
earlier period work
20世纪前期
the first half of 20th century
建设前期
earlier stage of construction
开发前期
early development
during production prophase
民国前期
the early Republic of China
in the early years of the Republic