伸缩自如 meaning in English

be capable of expansion and contraction

Numerous muscles inserts into the orbicularis oris inferior and superior muscles , providing a flexible system for lips protrusion , closure , retraction , elevation , and depression
轮颊肌为嘴唇上下方的肌肉，能让嘴唇的开合及前后伸缩自如。
The endografts that he and his associates are currently using are made of dacron supported by a nitinol stent skeleton , " which expands and presses the fabric graft across the area of the tear , " the surgeon said
他和他的同事目前使用的内支架是由镍钛合金的支架结构、外层的涤纶所构成， “这种结构使得这种纤维性支架可以伸缩自如，从而到达撕裂部位”这名外科医生说。