In our field we have to spend twice as much time as a historian or geographer, and comparative data about the same place in modern and ancient times are often uneven, so it's difficult to come up with earth-shattering results in a short time. That's another reason there's a dearth of scholars in the field.
一來研究者在基礎上就必須比歷史學或地理學多花一倍時間；其次是同一地方今昔對照，經常是不一致的，很難在短時間便做出驚天動地的結果，都是導致研究者稀少的原因。