[译] 没有许可证, 不得进入原子能研究所。
[误] You won’t get into the atomic research station without an admittance.

[正] You won’t get into the atomic research station without a permit.
[注] 名词 permit (= written authority to go somewhere) 作“许可证”解。又如:

• If you want to go fishing, you must bring with you a permit to fish.
  如果你想钓鱼, 你必须持有钓鱼许可证。

admittance (= being admitted to a place, esp. one that is not public) 意为“准许进入(某处, 尤其是非公共场所)”。如:

• I gained admittance to the membership of the club.
  我获准加入该俱乐部。