| 短语 | by / since when |
| 释义 | by / since when before or since which time在…之前/自从…:•The baby is due in May, by when the new house should be finished.宝宝的预产期在 5 月，那时新房子应该造好了。•That was written in 1946, since when the education system has undergone great changes.那是 1946 年写的，从那时起教育体制经历了巨大的变革。 |
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