http://www.pons.de/produkte/3-12-517841-X/(牛津大学出版社授权产品)
 
  
 I. toughen [美 ˈtəfən, 英 ˈtʌfn] 动词 trans
1. toughen (strengthen):
2. toughen person:
II. toughen [美 ˈtəfən, 英 ˈtʌfn] 动词 不及物动词
1. toughen (strengthen):
I. toughen up 动词 [美 ˈtəfən -, 英 ˈtʌfn -] (v + adv + o, v + o + adv)
1. toughen up (strengthen):
2. toughen up person:
II. toughen up 动词 [美 ˈtəfən -, 英 ˈtʌfn -] (v + adv)
1. toughen up (strengthen):
 
  
 在《PONS词典》中的词汇
 
  
 II. toughen [ˈtʌfən] 动词 不及物动词
 
  
 -  
-  toughening
 
  
 II. toughen [ˈtʌf·ən] 动词 不及物动词
 
  
 -  
-  toughening
| I | toughen | 
|---|---|
| you | toughen | 
| he/she/it | toughens | 
| we | toughen | 
| you | toughen | 
| they | toughen | 
| I | toughened | 
|---|---|
| you | toughened | 
| he/she/it | toughened | 
| we | toughened | 
| you | toughened | 
| they | toughened | 
| I | have | toughened | 
|---|---|---|
| you | have | toughened | 
| he/she/it | has | toughened | 
| we | have | toughened | 
| you | have | toughened | 
| they | have | toughened | 
| I | had | toughened | 
|---|---|---|
| you | had | toughened | 
| he/she/it | had | toughened | 
| we | had | toughened | 
| you | had | toughened | 
| they | had | toughened | 
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