pH
noun
piːˈeɪtʃ
noun
1
pH
a
number
on
a
scale
of
0
to
14
which
shows
how
acid
or
ALKALINE
a
substance
is
酸碱度， pH值
[+
of
]
soil
with
a
pH
of
3.1
酸碱度为 3.1 的土壤