万律第122页……
A spell of the polymorph
subschool changes the target’s
form from one shape
to another. Unless otherwise
noted in the spell’s description,
the target of a polymorph
spell takes on all the statistics
and special abilities of an average
member of the assumed
form in place of its own except
as follows.
• The target retains its own
alignment and personality, within
the limits of the assumed form’s
ability scores.
• The target retains its own hit points.
• The target is treated has having its normal Hit Dice for
purpose of adjudicating effects based on HD, such as the
sleep spell, though it uses the assumed form’s base attack
bonus, base save bonuses, and all other statistics derived
from Hit Dice.
• The target retains the ability to understand the languages
it understands in its natural form. If the assumed form
is normally capable of speech, the target retains the ability
to speak these languages as well. It can write in the
languages it understands, but only if the assumed form
is capable of writing in some manner—even a primitive
manner, such as drawing in the dirt with a paw.
In all other ways, the target’s normal game statistics are
effectively replaced by those of the assumed
form.
The target loses all the special abilities
it has in its natural form, including
its class features, even if the assumed
form would normally be able to use these
class features. 
