ser·vice·able /ˈsɝvəsəbəl/
  (a.)有用的,耐用的
  serviceable
  可用的
  serviceable
  可服務時間
  serviceable
  可服務
  Serv·ice·a·ble a.
  1. Doing service; promoting happiness, interest, advantage, or any good; useful to any end; adapted to any good end use; beneficial; advantageous. “Serviceable to religion and learning”. --Atterbury. “Serviceable tools.” --Macaulay.
     I know thee well, a serviceable villain.   --Shak.
  2. Prepared for rendering service; capable of, or fit for, the performance of duty; hence, active; diligent.
     Courteous he was, lowly, and servysable.   --Chaucer.
     Bright-hearnessed angels sit in order serviceable.   --Milton.
     Seeing her so sweet and serviceable.   --Tennnyson.
  -- Serv*ice*a*ble*ness, n. -- Serv*ice*a*bly, adv.
  ◄ ►
  serviceable
       adj 1: ready for service or able to give long service; "serviceable
              equipment"; "heavy serviceable fabrics" [ant: unserviceable]
       2: having a beneficial use; "a serviceable kitchen gadget"
       3: intended or able to serve a purpose without elaboration;
          "serviceable low-heeled shoes";