adj.未筛过的(未经详细检查的)
Theophilus Thistle,the thistle-sifter,sifted a sieve of unsifted thistles.If Theophilus Thistles,where is the sieve of unsifted thistles Theophilus Thistle,the thistle-sifter, sifted. （这是一则被美国许多绕口令爱好者认为是最难的，最拗口的绕口令。）
