a matter dealt with in a text, discourse, or conversation; a subject 题目,话题;主题 her favourite topic of conversation is her partner. 她最爱谈的话题便是她的伙伴。 ■(Linguistics)that part of a sentence about which something is said, typically the first major constituent (语言学)主题
语源
late 15th cent. (originally denoting a set or book of general rules or ideas): from Latin topica, from Greek ta topika, literally 'matters concerning commonplaces' (the title of a treatise by Aristotle), from topos 'a place'