retractable + noun
常指机械装置的部件
a retractable roof
一个可伸缩的屋顶
可收回的；可缩回的。；可以缩回的；伸缩自如的；可取消的
Capable of being drawn back or in.
可收回的；可缩回的。
Capable of being retracted; retractile.
可以缩回的
capable of being retracted
The pen has a retractable tip to prevent ink from drying out.
这支笔有一个可缩回的笔尖，以防止墨水干涸。
用法提示：retractable 作为形容词修饰 tip，表示可缩回的功能。
AI contextual example
The stadium's retractable roof opened automatically when the rain stopped.
体育场的可伸缩屋顶在雨停后自动打开。
用法提示：retractable 修饰 roof，表示可伸缩的特性。
AI contextual example
The contract includes a retractable clause that can be canceled within 30 days.
合同包含一个可在30天内取消的可撤销条款。
用法提示：retractable 修饰 clause，表示可取消的法律效力。
AI contextual example
常指机械装置的部件
a retractable roof
一个可伸缩的屋顶
The pen is retractable.
这支笔是可伸缩的。
描述具有可伸缩部件的物品
a knife with a retractable blade
一把带有可伸缩刀片的刀
grammar · medium
易错句子I bought a retract pen.
正确表达I bought a retractable pen.
“retract”是动词，而“retractable”是形容词，表示“可缩回的”，修饰名词时应用形容词形式。
grammar · medium
易错句子This pen retractable.
正确表达This pen is retractable.
中文学习者常遗漏系动词“be”，但“retractable”是形容词，需要与系动词连用作表语。
retractable 指可缩回或收起，collapsible 指可折叠成更小形状
retractable 指可缩回，extendable 指可伸长或展开
retractable 和 retractile 都表示可缩回，但 retractile 更常用于生物学或机械术语
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