| 单词 | linchpin | 
| 释义 | linchpinnoun  linch·pin  ˈlinch-ˌpin   variants  or less commonly lynchpin  1   : a locking pin inserted crosswise (as through the end of an axle or shaft)   2   : one that serves to hold together parts or elements that exist or function as a unit  the linchpin in the defense's case | 
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