| 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 |
无例句可用
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单语范例（未经PONS编辑处理）
This fire is used to dry and toughen the young wings, which is necessary for flight.
en.wikipedia.org Tony tells him to stop and reaffirms his decision, saying that he needs toughening up.
en.wikipedia.org It quickly toughens up and can withstand drought even whilst in forestry tubes.
en.wikipedia.org Compressed at and cured for in a steam bath, then toughened with an air entrainment agent, the bricks last for more than cycles.
en.wikipedia.org All those who passed through that testing have been toughened.
en.wikipedia.org