fastadj.快的；迅速的；紧的；牢固的；放荡的adv.快速地；紧紧地；放荡地；深深地n.斋戒；禁食；系泊用具v.斋戒；禁食fastopenn.[计算机] DOS命令 : 通过在RAM中存储前面打开文件和子目录的定位信息；以便提高系统的性能

1. Elastic rubber ball acts as a volume displacer, and 4-way reversing valve provides fast reversing and secure sealing.
   弹性橡胶球作为体积置换器，四通换向阀实现快速换向及可靠密封。