us·able /ˈjuzəbəl/
  (a.)可用的,使用方便的,有用的
  usable
  可用
  Us·a·ble a. Capable of being used.
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  usable
       adj 1: able to be put to use; "usable byproducts" [syn: useable]
       2: fit or ready for use or service; "the toaster was still
          functional even after being dropped"; "the lawnmower is a
          bit rusty but still usable"; "an operational aircraft";
          "the dishwasher is now in working order" [syn: functional,
           useable, in working order(p), operable, operational]
       3: convenient for use or disposal; "the house is available
          after July 1"; "2000 square feet of usable office space"
          [syn: available, useable]