mechanical sand barrier

aerate the sand

aerating the sand

anti-collision around the barrier

built on the sand

bury one’s head in the sand

curb the sand

direction of the mechanical energy flow

Discussing the mechanical ventilation technique

network monitoring for the mechanical and electrical equipment of warship

numberless as the sand

pan of the sand mill

plough the sand

prediction of the mechanical behaviors of rock engineering

prevention and control of the sand

Research on the mechanical failure of the engine

shedding of the the physical body

strengthen the sand

The barrier environment of laboratory animals