sink
sink/siŋk/ I.vi.&vt.(sank /sæŋk/, sunk /sʌŋk/) 1. (船等)下沉; (日、月)落；使下沉，使陷入：The ship sank to the bottom of the river.船沉入河底。The sun is sinking in the we···
sip
sip/sip/ I.vt.&vi.(sipped,sipping) 1.小口喝；抿：sip tea小口喝茶；sip the glass dry把玻璃杯内饮料喝干2.从…中吸：sip a flower吸花蜜‖II.n.非常小的一口；抿味：take a sip of bran···
sir
sir/sə:, sə/n.1.先生，阁下(对不相识的男子、上级、长辈或从事某一职务者的尊称)：Yes (No), sir.是(不)，先生(或长官等)。Good morning, sir.先生，早。2.信首用语：Sir先生(正式公函中的称···
siren
siren/ˈsaiərin/n.［c］警报，汽笛：ambulance(fire) sirens救护车（救火）警报器；air-raid siren空袭警报器In big cities you always hear sirens all the time.在大城市里,你总能听到警笛声···
sister
sister/ˈsistə/n.［c］1.姐妹，姐，妹：an elder sister姐姐；a younger sister妹妹They are brother and sister.他们是兄妹。2.同类型的东西：sister ships(schools)姐妹船（学校）
sit/sitting/sitting-room
sit/sit/vi.&vt.(sat /sæt/, sat; sitting)坐，就座：We sat under the shade of the tree.我们坐在树阴下。2.坐落，占位置：The city sits on a hill.城市位于山上。3.使就座：The mother···
site
site/sait/n.［c］位置，场所，地点：a conference site会址；the site of the Battle of Waterloo滑铁卢战役旧址；construction site建筑工地
situate/situated/situation
situate/ˈsitjueit/vt.使位于,使处于…地位(位置)：a conveniently situated hotel一家交通方便的宾馆；situate a monument on the hillside在山坡上建一座纪念碑They are trying to decide wh···
six/sixteen/sixteenth/sixth/sixtieth/sixtieth
six/siks/ I.num.1.六，六个(人或物)：the six of them他们六个人；six of them他们中的六个人Six and six is twelve.六加六等于十二。2.第六(卷、章、页等)：page six第六页；Volume Six等六卷···
sizable/size
sizable/ˈsaizəbl]/adj.相当大的，颇大的：a sizable man大个子；a sizable battle一场大仗；a sizable proportion of the population很高的人口比例；sizable increases in output产量有很大···
