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/occupant system人椅系统seat reservation voucher定座凭证seated directional valve座式换向阀seat distribution method席位公配方法seat-type survival kit座垫式救生包seats arranged in a wedge排列成楔形座位seat occupany coefficient座席占用系数seat-ejection initiator座椅弹射起爆器seat belt pre-tensioner安全带预紧装置seating directional valve座式换向阀