谁能帮我看看我的实习证明这样写可以不？

Certificate
of
Internship
This
is
to
certify

has
interned
at
this
company
for
twenty
days
from
12th
to
31st,
July
2010.
During
this
period,
she
has
adroitly
mastered
various
experiments
such
as
determination
of
volatile
phenol,
fast
determining
COD
and
DO
by
spectrophotometer
and
nearly
all
the
experiments
concerning
about
determination
of
main
indexes
of
water
samples.
She
has
also
gained
proficiency
in
the
usage
method
of
some
complicated
equipment
like
gas
chromatograph
and
flame
ionization
detector(FID).I
highly
appreciate
her
effort
and
diligence
as
she
would
like
to
participate
in
the
job
of
collecting
water
simples
which
is
really
a
hard
work
that
we
only
assign
males
to
cover
the
part.
To
speak
of,
it
is
very
hot
in
summer,
especially
in
late
July
and
samplers
would
spend
more
than
seven
hours
working
outside.
In
sum,
Ms.
XXX
has
acted
as
an
aggressive
and
outstanding
member,
and
has
kept
learning
professional
skills
and
theories.
She
has
finished
this
internship,
proved
to
be
a
self-disciplined
and
competent
team-worker.