Seathn.西思seatn.座位；底座；席位；臀部；所在地vt.使坐下；可容纳vi.坐seat type air supply座椅送风seat - arrangement座椅排列seated gas generator固定式燃气发生器seat on the exchange交易所席位seating arrangements席位的安排seat reservation fee订座费seat filler material座垫填充材料seat harness release座椅安全带解脱装置seat-type breather座式呼吸器seat reference point座位参考点