水利专业英汉词典
水利专业英汉词典：第127页
back wave
back-pumping equipment
backacter
backactor
backblow
backbone range
backcountry
backdate
backdraught
backfile
backfill grouting
backfiller
backflooding
backflow channel
backflow preventer
backflow valve
background
background concentration
background count
background information
background noise
background pollution
background radiation intensity
background seismic wave
backhand welding
backhoe front and loader
backing
backing log
backing ring
backing up
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