professional (adjective)
doing something as a paid job, not just for fun.
專業的
She is a professional tennis player.

foundation (noun)
an organisation that supports a cause or provides help
基金會
The foundation helps children struggling to afford education.

influential (adjective)
having the power to affect others or events
有影響力的
He is an influential leader in the community.

stroke (noun)
a movement made with the arms or legs in swimming
划水動作
The swimmer practiced her freestyle stroke.

concentrate (verb)
to focus all your attention on something
專注
Please concentrate on your homework.

wave (noun)
water that is raised above the water surface and often comes in a line, commonly seen at sea
波浪
The sound of waves crashing against the stones on the shore makes me feel at peace.