drought and flood at flood season  汛期旱涝

Drought and Flood During Flood Season  汛期旱涝

Drought and flood in flood season  汛期旱涝趋势

Drought(flood) in south and flood(drought) in north  南旱(涝)北涝(旱)

flood diversion and flood retarding  行蓄洪

flood prevention during flood season  汛期防洪

flood prevention in flood season  防洪渡汛

electrolytic previous treatment  电解预处理

ground previous high altitude installation  地面组拼高空安装

history of previous cesarean section  前次剖宫产史

in previous years  往年

influence from previous layer  相邻层的影响

longitudinal previous movement  纵向预偏

Normal tillage in previous crop  前茬耕作

No-tillage in previous crop  前茬免耕

old and previous design codes  新旧设计规范

on year-on-year basis;over the same period of the previous year  同比

Osteonecrosis due to previous trauma  创伤后引起的骨坏死

over the same period of the previous year  同比