signify
signify/ˈsiɡnifai/vt.表示…的意思，意味，预示：What does this word signify?这个词表示什么意思? He signified his agreement by nodding.他点头表示同意。
signpost
signpost/ˈsainˌpəust/ I.n. [c]指示牌，标志杆，路标：I have tried to provide some signposts.我曾经尽力提供一些标志物。We drove past a signpost I couldn’t read.我们驶过一块路标,可···
silence/silent/silently
silence/ˈsailəns/ I.n.［u］1.沉默，默不作声，(与不定冠词连用)无声的时间：listen to sb.in silence默默地听某人讲话Your silence on recent events surprises me.你对近来发生的事情保持沉···
silicon
silicon/ˈsilikən/n.［u］硅：silicon dioxide二氧化硅，硅土Silicon plays an important part in the inorganic world.在无机界中硅担任重要角色。
silk
silk/silk/ I.n.［u］1.蚕丝；丝织品，绸：silk reeling缫丝It is painted on silk.它是画在绸子上的。2.(pl.)绸服：She is dressed in silks and stains.她衣着华丽。‖II.adj.丝的，丝织的：s···
silly
silly/ˈsili/ I.adj.1.傻的，愚蠢的，糊涂的：a silly question愚蠢的问题Don’t be silly!别傻! It’s silly of you to believe him.你真傻，居然相信他。2.无聊的：a silly story无聊的故事‖···
silver
silver/ˈsilvə/ I.n.［u］1.银：fine/pure silver纯银；table silver银餐具2.银白色：have hair of silver长着银白色的头发3.银币：Have you any silver on you?你有银币吗? ‖II.adj.1.银的：···
similar/dissimilar/similarly
similar/ˈsimilə(r)/adj.相似的，类似的（[反]dissimilar）：have similar tastes in sth.对…有着相似的爱好；be similar to …与某人或某物相似The lens of a camera is similar to an eye.···
simmer
simmer/ˈsimə/ I.vt.&vi.煨，炖：Simmer the sauce gently until thickened.用文火煨调味汁直至变浓。The soup was left to simmer.汤放在火上慢慢煮。‖II.n. [u]煨，炖：Bring the pota···
simple/simplicity/simplification
simple/ˈsimpl/adj.1.简单的，简明的：a simple question简单的问题；give a simple explanation作简明的解释2.朴素的，朴实无华的：live a simple life过着朴素的生活；simple clothes朴素的衣···
