用法:
1 (esp Brit) = roller-coaster (roller).

用法:
2 zigzag railway or road for ascending or descending steep slopes （上下陡坡的）之字形铁路或公路.

• run wild(run wildly)
• satisfied(satisfactory)
• saw(saw down, saw up)
• say to oneself(talk to oneself)
• say(speak)
• say(talk)
• say(tell)
• scene(scenery)
• scrape up on acquaintance (with)(strike up on acquaintance (with))
• search(search for)
• seasonal(seasonable)
• seat(sit)
• see light(see the light)
• see sb do sth(see sb doing sth)
• see sb through(see through sb)
• see you again(see you later)
• sell off(sell out, sell up)
• send away(send off)
• send(send for)
• sensible(sensitive)
• sensual(sensuous)
• serve time(serve one's time)
• set down as(set down to)
• set eyes on(set one's eyes on)
• set hand to(set one's hand to)