■ prudent 与 prudential

两个形容词都是“审慎”的意思，但是前者用于指人或行为，后者用于指精神领域的思考、计划。

• A prudent man will try to save money for family emergencies.审慎的人会设法积蓄以备家庭不时之需。
• It is always prudent to plan a trip carefully.出门旅行事先仔细计划一番，总是审慎之举。
• Prudential considerations often cause persons to watch out for their health.审慎的考虑，常常使得人们注意自己的健康。

• story
• stranger
• strategy
• strategy 与 tactics
• street
• strength
• strew
• strike
• struggle
• student of
• study
• stuff
• stupid
• sturdy
• subject
• subscribe
• substance
• substitute
• substitute 与 replace
• succeed
• success
• successful
• successful 与 successive
• successive
• such