投球: throwing a ball, pitch / 等級: grade, class

(rare) rugby

throwing a ball / (baseball) pitch

to pitch, throw a ball / (baseball) to pitch (throw the ball toward home plate)

grade; class / (astronomy) magnitude

in addition; furthermore / on top of (which)

the above / the top (position or direction) / the surface of / superior in skill, age, level, etc.

the basics, a general idea

【Conjunction】after; on the basis of; upon

upper, over