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Otto cycle
agric.	汽油机的奥图循环
auto.	发动机奥托等容循环
avia.	定容加热循环
mech.eng.	内燃机的四冲程循环
nautic., tech.	等容循环
oil	奥托循环
refrig.	四冲程循环
tech.	内燃机的四冲程; 等定容循环

Otto cycle: 4 phrases in 3 subjects

Automobiles	1
Drilling	1
Oil / petroleum	2