0 An all-time high, low, best, etc. is the highest, lowest, best, etc. level that has ever been. -- 前所未有的，空前的
In the nineteenth century the proportion reached an all-time low of less than 3 per cent.
After the nineteen-twenties, however, a chasm opened up, and grammatical activity sank to an all-time low.
It continues to lose ground ever after until an all-time low is reached in 1981.
In the theatre this has got to be one of the all-time great dramatic moments.
The demographic post-war baby boom working its way up the age range to reach its all-time peak of nearly a million school-leavers in 1962 did not affect this situation.
Surprisingly, the conclusion of this agreement was reached during the phase when embargoes were made more severe and when trade exchange was at an all-time low.
As the decade of the 1980s drew to a close many perceived themselves as having never been so poor, with domestic production at an all-time low.
And this is a debate in which she has claimed that morale in the health service is at an all-time low.
