stiffening

US

UK

B1 中級
v.i.不及物動詞使變硬
The animals are stiffening when he opens the door
n. (u.)不可數名詞(使衣服等)變硬的材料
We need to add some stiffening to this collar
v.t.及物動詞使堅固
We are stiffening the floor by adding supports

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