flock 怎么不能用
flock英[flɒk]
美[flɑ:k]
n.兽群，鸟群; 群众; 棉束; 大堆，大量;
vi.群集，成群结队而行;
vt.用棉束填;
[例句]A single parrot cannot forage for fruit and watch for predators at the same time; it depends on its chittering flock for protection.
单只鹦鹉不可能在寻找水果的同时留意捕食者，它要依靠不停鸣叫的鸟群来保护自己。
[其他]第三人称单数：flocks 复数：flocks 现在分词：flocking 过去式：flocked 过去分词：flocked
这几个英文单词的区别
join 加入组织 机构 党等比较长期的东西
例句: He joined the Party last year.
他去年入了党。
Every young man in the village joined the battle.
村里的所有年轻男子都参加了战斗。
join in = take part in = participate in
participate是不及物动词喔 所以坐参加的话还应加个in
这些参加表示加入那些 加入一次 就解散的东西 比如活动啦 等等
例句：
More than six million Germans and tourists take part in Oktoberfest each year to eat, drink, and celebrate.
每年皆有超过六百万的德国人和游客参加啤酒节，一同吃喝玩乐并大肆庆祝。
attend 比较正式的场合用 一般口语不用
是指出席的意思，你就想一般什么场合用出席 就是用attend
be present at (meetings, church services, university), etc.
例句: She attends class regularlyI rarely attend services at my church
to attend a concert
去听音乐会
to attend church
上教堂做礼拜
