请问一下几个英语词组的区别：take part in,join与attend

attend 一般指参加比较正式的，大型的场合如attend assembly（也可以指去教堂attend the church）
join一般指入团，入党，入组织 eg join the arm，join a club
take part in一般指参加正在进行的活动，参加者在活动中起一定的作用，可以和join in互换

take part in v. 参与, 参加
take part in a parade
参加游行
take part in the entrance exams for postgraduate schools
考研
To take part in a wrestling match with.
与（某人）一起参加摔跤比赛
To take part in a boxing match with.
与…进行拳击比赛
Will you like to take part in the tender?
贵公司想参加这次投标吗？
To take part in a dangerous or risky undertaking.
玩火，冒险参加危险或冒险的任务
To do or take part in half - heartedly.
玩不认真地做或参加
The ability to take part in a chemical reaction.
活性，活度参加化学反应的性能
Who have been selected to take part in the project?
挑上谁来参与这项计画？
join
vi.
参加, 结合, 加入
vt.
连接, 结合, 参加, 加入
n.
连接, 结合, 接合点
[计] 用子目录名取代驱动器符
join two widths
把两幅料子拼起来
join an expedition
参加远征队[探险队]