sort n.种类，类别；分类；挑选
like this sort of candy best.我最喜欢这种糖果。
The clerk sorted the invoices by their dates.记账员按日期对发票进行分类。
sound n.声音 adj.健全的，健康的；牢固的
Sound travels through air in waves about 1,115 feet (340 meters) per second.声音以声波形式在空气中传播，速度约为每秒1，115英尺 (340米)。
His body is very sound considering his age.就他的年龄而言，他的身体非常健康。
source n.源头，来源
The newspaper gets news from many rawrces.报纸从许多来源获得新闻。
sow v.播种
The farmer sowed the field with wheat.农民在田里播种小麦。
span n.跨度；一段时间
The span of the bridge is three miles.这座桥的跨度有三英里。
The old man’s life spaned 90 years.这个老人活了90岁。
spare adj.多余的，备用的 v.节约，节省
Have you got a pen? I’ve left all mine at home.你有没有多余的钢笔？我把我的全都落在家里了。
The company appears to have spared no expense in designing and building the new shoe store.公司为了设计和建造新鞋店似乎不惜成本。
spark n.火花，火星
The burning wood threw off sparks.燃烧的木头溅出火星。
The murder sparked off panic among the residents.这件凶杀案在居民当中引起了恐慌。
specialize v.专攻；使适应特殊情况；专门从事
She’s hired a lawyer who specializes in divorce cases.她雇用了一位擅长离婚案的律师。
specific adj.具体的，特指的
Feathers are a feature specific to birds.羽毛是鸟类专有的特征。
specimen n.标本，样品
As a geologist, she collects specimens of all kinds of rocks and minerals.作为一名地质学家，她收集各种岩石和矿物的样本。