| I | refract |
|---|---|
| you | refract |
| he/she/it | refracts |
| we | refract |
| you | refract |
| they | refract |
| I | refracted |
|---|---|
| you | refracted |
| he/she/it | refracted |
| we | refracted |
| you | refracted |
| they | refracted |
| I | have | refracted |
|---|---|---|
| you | have | refracted |
| he/she/it | has | refracted |
| we | have | refracted |
| you | have | refracted |
| they | have | refracted |
| I | had | refracted |
|---|---|---|
| you | had | refracted |
| he/she/it | had | refracted |
| we | had | refracted |
| you | had | refracted |
| they | had | refracted |
单语范例（未经PONS编辑处理）
Higher values of wind gradient will refract sound downward toward the surface in the downwind direction, eliminating the acoustic shadow on the downwind side.
en.wikipedia.org In contrast, the play of colours in opal is caused by light refracting from ordered microscopic silica spheres within its physical structure.
en.wikipedia.org Because temperature and density change with height, the sound of thunder is refracted through the troposphere.
en.wikipedia.org However, all these disturbances refract light rays, so they can cast shadows.
en.wikipedia.org It consists of two observatory buildings housing an 11 inch (28 cm) and 16 inch (41 cm) aperture refracting telescope.
en.wikipedia.org