retractable

adj that can be drawn in 可缩进的; 可拉入的: a retractable undercarriage 伸缩式起落架.

retentiveness, rethink, reticence, reticent, reticently, reticulated, reticulation, reticule, retina, retinue, retire, retired, retirement, retirement age, retiring, retort, retouch, retrace, retract, retractability, retractile, retraction, retread, retreat, retrench, retrenchment, retrial, retribution, retributive, retrievable, retrieval, retrieve, retriever, retro-, retro-rocket, retroactive, retroactively, retroflex, retrograde, retrogress,