| 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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