specialize
verb
ˈspeʃəlaɪz
verb
1
to
limit
all
or
most
of
your
study,
business
etc
to
a
particular
subject
or
activity
专门研究，专门从事，专攻
[+
in
]
Simmons
specialized
in
contract
law.
西蒙斯专攻合同法。