| 例句 |
retardationnoun a usually gradual decrease in the pace or level of activity of somethingscientists discovered that they could achieve the retardation of light if they shined it through a variety of substances braking, deceleration, downshift, letup, slowdown decline, drop, slumpebb, remission, retreat, waneflagging, weakeningarrest, check, halt, stoppagecollapse, crash, fall, plunge acceleration, hastening, quickening in the 15th century |