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1.spectator n.观众：旁观者(one who looks on or watches)
词根记忆：spect(看)+ator--观众；旁观者
例：The bleachers at the game were filled with spectators.//We mustn't stand by as a spectator.
2.specter n．幽灵(ghost)；萦绕在心头的恐惧(phantasm)
联想记忆：spect(看)+er--引入注目的东西--幽灵
例：The princess saw a specter in the corridor.//John was haunted by the specter of his past sins.
3.spectrum n.范围(scope)；光谱(a continuum of color formed when a beam of white light is dispersed( as by passage through a prism) so that its component wavelengths are arranged in order)
词根记忆：spectr(光谱)+um--光谱
例：Mary's spectrum of scientific knowledge ranged from anatomy to zoology.//The ultraviolet band of the spectrum emitted by the Sun is harmful to the human body.//X-ray spectrum X 射线谱//electromagnetic spectrum电磁波频谱
4.speculate v.推测(to reflect, to think)；做投机买卖(to assume a business risk)
词根记忆：specul(看)+ate--用心看--推测
例：Marine biologists speculated that clicking sounds emitted by dolphins might have another function.//The banker speculated in mutual funds.
派生词：speculation(n．推测；投机买卖)：speculative(a．推测的)
5.speculation n.思索；推测（an act or instance of speculating）；投机(a transaction involving such speculation)
词根记忆：来自speculate(v.思索；推测)
例：They have confirmed researchers' speculation that masses of hot rock are buoyant enough to rise to the upper part of Earth's mantle.
同根词：suspect(v.怀疑；猜想)
6.speculator n．投机者(someone who buys or sells in expectation of profiting from market fluctuations)；思索者(someone who ponders)
词根记忆：来自speculate(v.投机：推测)
例：In 1929 relatively small declines in the market ruined many speculators who had bought on margin; they had to sell, and their selling pushed other investors to the brink.
同根词：speculative(a．投机的；推测的)
7.sphere n.球(globe);领域(an area or range)
联想记忆：地球是被大气(atmosphere)环绕着的球体(sphere)
例：armillary sphere浑天仪 //material and spiritual sphere物质领域和精神领域
同根词：hemisphere(n．半球)；atmosphere(n．大气层)：biosphere（n．生物圈）
8.spherical a．球的，球状的(having the form of a sphere or of one of its segments)
词根记忆：来自sphere(n．球体)
例：Cartographers have long struggled with the problem of how to draw the spherical Earth on a flat sheet of paper.
派生词：spherically( ad.球地，球状地) -
同根词：sphericity (n．球形：球面)
9.spiced a．加香料的，加调料的(containing spice or spices)
例：The chef cooked the beef in a heavily spiced stew.
n. 期待，期望
