they; them (plural form of [[它|它|ta1]], used for animals, objects, or concepts)

other; others; the rest. This form is used primarily for inanimate objects and is now usually written as [[其他|其他|qi2 ta1]].

a guitar

Describes one's will or commitment being steadfast until death; originally used to describe a widow's vow not to remarry.

literally meaning stones from other hills can be used to polish jade; used as a metaphor for using advice, criticism, or outside help to improve oneself or correct one's faults

stones from other hills may serve to polish one's own jade; literal meaning suggests using advice or resources from others to improve one's own character or work

itself; per se

(literary) camel

an annoying or troublesome person

used to express that a person does not care about something, or to advise someone not to worry about a situation; regardless of; let it be

(loanword) vitamin

isn't it better to spend the money on pork ribs; a rhetorical question used to suggest that spending money or effort on a specific useful or delicious thing is much better than wasting it on something inferior