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单词 helixometer
释义 helix·om·e·ter
\ˌ ̷ ̷ ̷ ̷ˈsäməd.ə(r)\ noun
Etymology: helix + -o- + -meter
: a tubular instrument in which an electric light and a prism and lens system enable visual examination of a small-arms bore (as in criminal investigation)
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