pivot：中心，枢轴，核心

来自古法语pivot,绞链，门合页。引申词义中心，枢轴，核心等。

• summit
• summon
• sump
• sumptuary
• sumptuous
• sun
• sunbathe
• sunblock
• sunburn
• sunburst
• sundae
• Sundae
• Sunday
• sunder
• sundial
• sun-drenched
• sun-dried
• sundries
• sundry
• sunflower
• sunglasses
• sunk
• Sunni
• sunny
• sunrise