后缀：-s [副词后缀]

表示时间、地点、方式、状态

afternoons 每天下午

nights 每夜，在夜间

weekends 在每个周末

sometimes 有时

besides 此外，而且

unawares 不知不觉地

nowadays 现今，当今

outdoors 在户外

indoors 在屋内

upstairs 在楼上，往楼上

downstairs 在楼下，往楼下

weekdays 在每个周日

词根词缀：in-3

【来源及含义】Old English, Middle English: in, into; within; toward; a prefix used in front of English words, not Latin or Greek elements; as in the words, indoors and inland

【相关描述】Don't confuse this in-³, meaning "in, into; within", with another in-² Latin prefix meaning "in, into, within, inside, on, toward" or with the Latin prefix in-¹ meaning "not".

【同源单词】inarm, inbeing, inboard, inborn, inbound, inbreathe