| 释义 |
underdrainenUK
underdrain n (Agriculture) a drain buried below agricultural land vb (Agriculture) to bury such drains below (agricultural land) ˈunderˌdrainage nunderdrain
Past participle: underdrained
Gerund: underdraining
| Imperative |
|---|
| underdrain | | underdrain |
| Present |
|---|
| I underdrain | | you underdrain | | he/she/it underdrains | | we underdrain | | you underdrain | | they underdrain |
| Preterite |
|---|
| I underdrained | | you underdrained | | he/she/it underdrained | | we underdrained | | you underdrained | | they underdrained |
| Present Continuous |
|---|
| I am underdraining | | you are underdraining | | he/she/it is underdraining | | we are underdraining | | you are underdraining | | they are underdraining |
| Present Perfect |
|---|
| I have underdrained | | you have underdrained | | he/she/it has underdrained | | we have underdrained | | you have underdrained | | they have underdrained |
| Past Continuous |
|---|
| I was underdraining | | you were underdraining | | he/she/it was underdraining | | we were underdraining | | you were underdraining | | they were underdraining |
| Past Perfect |
|---|
| I had underdrained | | you had underdrained | | he/she/it had underdrained | | we had underdrained | | you had underdrained | | they had underdrained |
| Future |
|---|
| I will underdrain | | you will underdrain | | he/she/it will underdrain | | we will underdrain | | you will underdrain | | they will underdrain |
| Future Perfect |
|---|
| I will have underdrained | | you will have underdrained | | he/she/it will have underdrained | | we will have underdrained | | you will have underdrained | | they will have underdrained |
| Future Continuous |
|---|
| I will be underdraining | | you will be underdraining | | he/she/it will be underdraining | | we will be underdraining | | you will be underdraining | | they will be underdraining |
| Present Perfect Continuous |
|---|
| I have been underdraining | | you have been underdraining | | he/she/it has been underdraining | | we have been underdraining | | you have been underdraining | | they have been underdraining |
| Future Perfect Continuous |
|---|
| I will have been underdraining | | you will have been underdraining | | he/she/it will have been underdraining | | we will have been underdraining | | you will have been underdraining | | they will have been underdraining |
| Past Perfect Continuous |
|---|
| I had been underdraining | | you had been underdraining | | he/she/it had been underdraining | | we had been underdraining | | you had been underdraining | | they had been underdraining |
| Conditional |
|---|
| I would underdrain | | you would underdrain | | he/she/it would underdrain | | we would underdrain | | you would underdrain | | they would underdrain |
| Past Conditional |
|---|
| I would have underdrained | | you would have underdrained | | he/she/it would have underdrained | | we would have underdrained | | you would have underdrained | | they would have underdrained |
underdrainenUK
underdrain[′ən·dər‚drān] (civil engineering) A subsurface drain with holes into which water flows when the water table reaches the drain level. underdrain  underdrain A drain, installed in porous fill, for drawing off surface water or water from the soil, as under the slab of a structure. |