| 释义 | retractablere‧tract‧a‧ble /rɪˈtræktəbəl/ adjective    a retractable part of something can be pulled back into the main part:a retractable razorThe new stadium will have a retractable roof.
 For another $ 50 million to $ 85 million of public money, a retractable dome could be added, they said.It is equipped with a Grando fully retractable safety cover.Screwdriver blades might have a retractable sheath or ultrasonic guards, for example.Short twin smoke-stacks rose from the afterdeck, but, being retractable, offered no target during combat.The main stadium has a retractable roof.The tail-wheel was not retractable, but could be steerable as an option.The tailwheel was made to be retractable and a third seat was added along with a gun position.
 a knife with a retractable blade |