prerequisite = something required (something needed to happen)
rather = instead 相反地/ in some degree在tain
sank (sink的过去式)= descended; dropped to the bottom
scant = minimum
sited = located
sophisticated = refined /elaborated /complex
ubiquitous 到处存在的 = common
unanimity = total agreement
spectator = viewer
sporadic = intermittent /irregular
stylus 铁笔，针状物 = pen
unconceivable = unimaginable
uniformly = evenly/ without variation/consistently
unique = sole/ distinct
warranted = authorized 授权的/justified
assume=take on 呈现/ suppose, posit 假设
foster=promote ，encourage
Plumage羽毛=feather
Composition作文，成分，混合物=mixture
relatively=comparatively
substitute=replacement
premise= assumption
within= inside