人口年龄构成

population composition by age

• speculation
• speculative
• sped
• speech
• speed
• speedier
• speeding
• speedway
• speedwell
• speedwriting
• speedy
• speenhamland system
• speer
• speer，albert
• spee，maximilian，graf von
• speke，john hanning
• speleology(或spelaeology、spelunking)
• spell
• spelling
• spelunking
• spemann，hans
• spencer
• spencer gulf
• spencer，herbert
• spencer，lady diana