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已知叫做
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1.
19As
people
grow
older
,
an
enzyme
known
as
PEP
increasingly
breaks
down
the
neuropeptide
chemicals
involved
in
learning
and
memory
.
19
随着
人们
的
衰老
,
一种
已知
叫做
PEP
的
酶
不断
地
分解
与
学习
和
记忆
有关
的
神经肽
化学物质
。
shí jiǔ
suí zhe
rén men
de
shuāi lǎo
,
yī zhǒng
yǐ zhī jiào zuò
PEP
de
méi
bú duàn
de
fēn jiě
yǔ
xué xí
hé
jì yì
yǒu guān
de
shén jīng tài
huà xué wù zhì
。
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