long cylindrical things such as glasses of drink, pairs of jeans, pens or trains and buses / films or TV shows / home runs or goals / rounds of a match in boxing, wrestling or judo

Alternative form of 元

book / this / main / real / actual / true

set of problems

problem; point at issue

text that makes up a question/problem

matter of life or death / (idiomatic) an extremely urgent matter

(informal) no problem

unthinkable, out of the question

practical question (problem)