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备用容量
CNC	idle capability
econ.	idle capacity
el.	margin of power; capability margin; capacity reserve
hydroel.st.	reserve capacity; standby capacity
met.	reserve power; spare capacity; stand-by capacity
oil	marginal capacity
space	margin capacity
备用〔储备〕容量
econ.	idle capacity
备用容量〔功率〕
econ.	idle capacity
备用〔边限〕容量
el.	marginal capacity

备用容量: 21 phrases in 4 subjects

Economy	1
Electronics	7
Hydroelectric power stations	6
Technology	7