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单词
ultravacuum
释义
ultravacuum
(
ˌʌltrəˈvækjʊm
,
ˌʌltrəˈvækjʊəm
)
noun
physics
1.
an extremely high level of vacuum
2.
a machine or device for creating such a vacuum
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更新时间:2025/6/4 1:31:20