I. research [rıˈsɜːtʃ] 名词
operational research 名词, operations research
-  operational research
-  
operations research 名词
operations research → operational reasearch
| I | research | 
|---|---|
| you | research | 
| he/she/it | researches | 
| we | research | 
| you | research | 
| they | research | 
| I | researched | 
|---|---|
| you | researched | 
| he/she/it | researched | 
| we | researched | 
| you | researched | 
| they | researched | 
| I | have | researched | 
|---|---|---|
| you | have | researched | 
| he/she/it | has | researched | 
| we | have | researched | 
| you | have | researched | 
| they | have | researched | 
| I | had | researched | 
|---|---|---|
| you | had | researched | 
| he/she/it | had | researched | 
| we | had | researched | 
| you | had | researched | 
| they | had | researched | 
