to persevere with; to persist in; to insist on

staunch; strong

to believe firmly; without any doubt

firm; steady; staunch; resolute

nut

America

core; nucleus; backbone

Sun Jian (155-191), famous general at end of Han dynasty, forerunner of the southern kingdom of Wu of the Three Kingdoms

to assault a fortified position; (fig.) to concentrate one's efforts on a particularly difficult part of one's mission

first Sui emperor Yang Jian (541-604), reigned 581-604