■ keep

keep 的直接宾语往往后面还有宾语补足语，而且这个宾语补足语可能很晚才出现。要注意抓住呼应关系，不要“断线”。

• …keeping the stakes of a first military move by the other side extremely high …一直使得对方如果先下手采取军事行动都要下极高的赌注。

• still others
• still 与 yet
• stipulation
• stop
• storey
• 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