a.

1. 确切的，精确的
   It was difficult to tell her exact age.

   很难说出她的确切年龄。

2. 精确无误的，精密的
   The scholar is an exact thinker.

   这位学者思维严谨。

3. 严格的

vt.

1. 强要；勒索
   The kidnappers exacted ransoms for their hostages.

   绑匪勒索人质的赎金。

2. 急需，需要

adj.

▸accurate or correct in all details:

an exact replica.

v.

1. demand and obtain (something) from someone.
2. inflict (revenge) on someone.