group: implies some unifying relationship and ordinarily a degree of physical closeness: a ~ of people waiting for a bus. group buying/purchasing团购, group discussions分组讨论working groups工作组ethnic/religious groups民族族群/信众
cluster: basically refers to a group of things growing together: a ~ of grapes; but it is often extended to persons or things that form small groups especially within larger masses: cataloging ~s of stars. 如计算机集群computer cluster花团锦簇flowers in clusters星簇clusters of stars
bunch: is likely to imply a natural or homogeneous association of similar things or persons: a ~ of bananas. 强调自然、相似、均匀，如a bunch of grapes/keys/flowers/stuff一串葡萄/钥匙/一束鲜花/一堆活儿
parcel: is likely to convey an impression of disapproval: the whole story was a ~ of lies. 一派谎言 另一个意思是(特别是邮递的)包裹something wrapped in paper especially sent by post如there's a parcel and some letters for you有你的一个包裹和几封信，如food parcels食品包裹
lot: applies to persons or things that are associated or that have to be dealt with as a whole: the books were sold in ~s.
group群组: 表示各成员有共同之处(unifying relationship统一)，如位置接近，cluster群簇: 指生长在一起的群组，特别是大群体里的一个个小组，bunch一捆一堆: 指自然相似均匀，parcel一包: 含贬义不赞成，lot一件: 指作为整体不可再分
记忆方法: 1）首字母GCBPL中的BG想成8个，PLC是警察police三个音节开头，8个警察<==一个群组 "组"本意指"丝带"，"且"表示物品，糸且合用表示用丝为贯穿把物品连接统合，如组合组织组建组成小组分组组曲组诗一组电池 "群"，从羊君声，本义指"牲畜聚合一处"，泛指同类相聚，引申为众多的意思，如人群羊群集群建筑群成群结队群起群购群贤毕至群众 "件"从人从牛，本义是"分解分开"，说文中说"牛大物故可分"。表示事物或者作量词时，保留了强烈的"被分开因而独立"的暗示，如一件事一件衣服文件证件lot一件
2）练习一下
3）群组的意思是不同成员组成的集合mean a collection or assemblage of separate units.首字母GCBPL中的BG想成8个，PLC是警察police三个音节开头，8个警察<==一个群组 assemblage集合汇聚，来自词根SEMBL表示same, alike相似相同，等于assembly
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