sick/sickly/sickness
sick/sik/adj.1.有病的：He lay in bed sick.他卧病在床。2.恶心的(只作表语)：feel sick觉得要呕吐I am always sick in car.我晕车。Mark felt sick with fear.马克怕得感到一阵恶心。3.(口语)···
side/sideline/sidewalk/sideways/sideway
side/said/ I.n.［c］1.边，面：on the opposite side of the street街那边A box has a top, a bottom and four sides.一个盒子有底、顶和四个侧面。We should look on the bright side of thin···
siege
siege/si:dʒ/n.［c］1.包围；围城；围攻期间；长期折磨: siege warfare围攻战；press a siege猛烈围攻；stand a siege抵住围攻；undergo a siege被围攻；a siege of illness疾病的长期折磨2.再···
sieve
sieve/siv/ I.n.［c］1.（细）筛；格筛；滤网，漏勺: pass flour through a sieve用筛子筛面粉；a head/memory /mind like a sieve健忘的脑子：If you have a memory/mind like a sieve, you fo···
sift
sift/sift/vt.筛分，过滤；详审：sift the flour into a large bowl将面粉筛进一个大碗中；to sift (out) the good from the bad去粗取精He lay on the beach, sifting the sand through his fi···
sigh
sigh/sɑi/ I.n.［c］叹息(声)：breathe a sigh of relief宽慰地舒口气；give/utter a deep (little) sigh重重(轻轻)地叹了口气‖II.vi.叹息，叹气：sigh with tiredness/weariness发出一声疲倦···
sight/sightseeing
sight/sait/n.［u］1.视力，视觉：lose one’s sight in an accident在一次事故中失明；have good (poor) eyesight视力好(差) 2.看见：fall in love with each other at the first sight一见钟情···
sign/signal
sign/sain/ I.n.［c］1.记号，信号：Words are the signs of ideas.言语是思想的符号。2.招牌，标记：Pay attention to the road signs!注意路牌! 3.迹象，征兆: Very often dark clouds are a ···
signature
signature/ˈsiɡnətʃə/n.［u］签名，署名；签字：put one’s signature to a letter在信上署名；send letters to the manager for signature把信送给经理请签字
significance/significant
significance/siɡˈnifikəns/n.［u］1.意义，含义：be of far-reaching historical significance具有深远的历史意义；understand the significance of a remark了解某句话的意义2.重要性，重大···
