动词
中文翻译：使变柔软
同义词：
['soften', 'relax', 'soften例句：1. The fabric has been unstiffened with a special treatment.（这织物经过特殊处理变得柔软了。）']
例句：
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1. The fabric has been unstiffened with a special treatment.
这织物经过特殊处理变得柔软了。
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2.After the surgery, she was unstiffened and could move around more freely.
手术后，她变得柔软了，可以更自由地移动。
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3. The old sofa had been unstiffened by years of use.
旧沙发因年久失修而变得柔软了。