tough·en 
(tŭfən)
(tŭfən)tr. & intr.v. tough·ened, tough·en·ing, tough·ens
To make or become tough. See Synonyms at harden.
toughen·er n.
| 单词 | toughen |
| 释义 | tough·en (tŭfən)tr. & intr.v. tough·ened, tough·en·ing, tough·ens To make or become tough. See Synonyms at harden. toughen·er n. |
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