to develop or exploit resources / to develop or create new products or fields / to cultivate talent or ability

change of name

rename; change one's name

(military) navy

(nautical) pirate (one who plunders at sea)

seawater

intervene, step in (an argument), edge in (a market)

Kyūjitai form of 貝殻: shell; seashell

nostalgia; longing for the old days

improvement, an action taken to improve / improvement, a spontaneous change for the better