double helical gear (herring-bone gear)
equivalent spur gear of the bevel gear
equivalent spur gear of the helical gear
gear quadrant steering gear
gear shaping cutter for straight bevel gear
gear slotting cutter for spur gear
Generating gear of a gear
harmonic gear drive with radial gear meshng
harmonic gear drive with transverse gear meshng
planetary gear with conical involute gear
three-shaft Xing-type gear transmission with inner planet gear
Benthic-pelagic coupling
coupled pelagic-benthic ecosystem
freshwater pelagic diatom
pelagic
鹈形目鸟类
远洋的
大洋栖息性
外洋性的
中上层
浮游性
表层的
深海的
浮游的
pelagic abyssal sediment