The restaurant capitalized on the summer tourist season by adding more outdoor seating.

capitalized 是动词 capitalize 的过去式。capitalize 由 capital（资本、资源）加后缀 -ize（使...化）构成，本义是"资本化"，引申为"利用、从...中获利"的意思。这里指餐厅充分利用旅游旺季的机会来增加收益。