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Text 2 Under pressure from animal welfare groups, two national science teachers associations ha...

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under high pressure  under low pressure  heated to reduce viscosity  cooled to increase viscosity  
act as a shock absorber  maintain the stored oil under pressure  act as a base or foundation for the power unit  eliminate pressure surges in the system  
pick up    turn up    break up    build up  
low exhaust back pressure  early fuel injection in one of the cylinders  compression pressure in one of the cylinders  plugged injector holes  
The plane exerts pressure on the pilot.  The plane is not installed with a piece of equipment to pump in outside air.  The plane cannot keep stable in the storms because the air pressure is not high enough.  The pilot does not feel comfortable under pressure.  
broke down    broke in    broke off    broke out  
alternator  glass thermometer  burdon tube  piezoelectric pressure transducer  
back and fro  back and forth  to and forth  fro and to  
radioactive elements  the great pressure of the earth  not determined  the heart remaining from the formation of the earth  
tend to twist about its long axis  expand in length and in diameter  contract in length and expand in diameter  flex at right angles to the applied pressure  
under way  under control   under pressure  under repair  
compressor/condenser  condenser/evaporator  throttle valve/evaporator  evaporator/condenser  
pressure    agreement    help    advice  

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