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单词 file
释义
file 2 (fīl)
n.
1. Any of several hardened steel tools with cutting ridges for forming, smoothing, or reducing especially metallic surfaces.
2. A nail file.
3. Chiefly British A crafty or artful person.
tr.v. filed, fil·ing, files
To smooth, reduce, or remove with or as if with a file.

[Middle English, from Old English fīl; see peig- in the Appendix of Indo-European roots.]
file2
left to right: double-cut flat file, single-cut round file, and single-cut half-round file
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