sett（n.）
见 set（n.1）。
The extra t is an arbitrary addition in various technical senses, from a lawn-tennis to a granite set. Each class of persons has doubtless added it to distinguish the special sense that means most to it from all others ; but so many are the special senses that the distinction is now no more distinctive than an Esq. after a man's name, & all would do well to discard it. [Fowler]
在各种技术意义上，从草地网球到花岗岩组，都是任意添加的额外 t。每个人群无疑都添加了它，以区别于所有其他意义中最重要的特殊意义； 但是，由于特殊意义如此之多，所以区别现在已不再具有区别性，就像一个人名后面的 Esq.一样，所有人都应该放弃它。[福勒]