| I | refine |
|---|---|
| you | refine |
| he/she/it | refines |
| we | refine |
| you | refine |
| they | refine |
| I | refined |
|---|---|
| you | refined |
| he/she/it | refined |
| we | refined |
| you | refined |
| they | refined |
| I | have | refined |
|---|---|---|
| you | have | refined |
| he/she/it | has | refined |
| we | have | refined |
| you | have | refined |
| they | have | refined |
| I | had | refined |
|---|---|---|
| you | had | refined |
| he/she/it | had | refined |
| we | had | refined |
| you | had | refined |
| they | had | refined |
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单语范例（未经PONS编辑处理）
Does he start off with a model, then refine it?
en.wikipedia.org It used n-paraffins (byproducts of oil refining) as feedstock for yeast, which in its turn produced single-cell protein, used as poultry and cattle feed.
en.wikipedia.org Rf with a half-life of 65 seconds (later refined to 75 seconds).
en.wikipedia.org To this end her design course helped members to refine their abilities to see the elements of design in the world around them.
en.wikipedia.org It would take another 30 years until the technology had been refined and the size of the iron stove been reduced enough for domestic use.
en.wikipedia.org