join的用法？

join的用法？

①表示【加入/参加（组织或团体）】，是及物动词，直接用【join sth】，英语解释为 If you join an organization, you become a member of it or start work as an employee of it. .例如： join the league/army /party入团/参军/入党② 表示【参加某种活动（多指正在进行的活动）】，英语解释为If you join an activity that other people are doing, you take part in it or become involved with it. 参加 (活动)搭配有两种： join sb (in sth) 【If one person joins another, they move or go to the same place, for example, so that both of them can do something together. 和…一道】 join sb in doing sth 例如： We'll go to the beach for a sunbath,will you join us? Will you join us in the game? Will you join us in play basketball? 可见，当表示【加入/参加（组织或团体）】时，join后面没有必要用介词in. 原题中，语境是巧返： It's not necessary to 【join a health center 】to keep fit. 为了保持健康，没有必要【加入健康中心】。 这正符合join的第一种用法，所以，不需要用in。 其他用法还有：③. If you join a line, you stand at the end of it so that you are part of it. 加入 (队列)例：It is advised that fans seeking autographs join the line before practice starts.建议寻求亲笔签名的影迷们在活动开始前排好队。④. To join two things means to attach or fasten them together. 连接; 接合例：The opened link is used to join the two ends of the chain.这个开口环是用来连接链条两头的。例蚂隐：...the conjunctiva, the skin which joins the eye to the lid.…结膜，连接眼球和眼睑的外膜。⑤. If something such as a line or path joins two things, it connects them. (线、路等) 连接 (两物)例：...a global highway of cables joining all the continents together.…一条连接各大洲的全球电缆主干线路。⑥闷宽厅. If two roads or rivers join, they meet or come together at a particular point. 汇合例：Do you know the highway to Tulsa? The airport road joins it.你知道通往塔尔萨的公路吗？机场公路和它相连。