If you are sitting or standing upright, you are sitting or standing with your back straight, rather than bending or lying down.
Helen sat upright in her chair.
海伦笔直地坐在椅子上。
He moved into an upright position.
他换成了一个挺直的姿势。
An upright vacuum cleaner or freezer is tall rather than wide.
An upright chair has a straight back and no arms.
He was sitting on an upright chair beside his bed, reading.
他正坐在床边一把直背椅上看书。
You can describe people as upright when they are careful to follow acceptable rules of behaviour and behave in a moral way.
a very upright, trustworthy man.
一个非常正直可靠的人。
uprights
You can refer to vertical posts or the vertical parts of an object as uprights.
the uprights of a four-poster bed.
一张四帷柱大床的立柱。