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词汇
safety valve
释义
safety valve
/ˈ·· ·/
n
[C]
1
something that prevents a dangerous situation developing 〔预防危险的〕安全措施
2
a part of a machine that allows gas, steam etc to be let out when the pressure is too high 〔机器的〕安全阀
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herbiest
herbivore
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herblike
herbs
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*here
here
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here-and-now
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here-below
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