age-harden
verb
1 [no object] To undergo age-hardening.
2 [with object] To subject to age-hardening.
Origin
1920s.
| 单词 | age-harden |
| 释义 | age-hardenverb 1 [no object] To undergo age-hardening. 2 [with object] To subject to age-hardening. Origin |
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