毛衣袖子长了怎样改短改小,毛衣里面的袖子太长怎么改短

{"rich_content":{"text":"","spans":null},"video":{"vid":"v028b0770000c0n9f9ksm0rufv36i670","duration":118.376,"width":960,"height":540,"file_size":15181924,"thumb":{"web_uri":"tos-cn-p-0000/e80ae4188e2b4621bdb8e0cb0563591c","width":640,"height":360,"image_type":null,"mimetype":null,"encrypt_web_uri":null,"secret_key":null,"encrypt_algorithm":null,"extra":null},"video_size":{"high":{"duration":118.376,"file_size":15029205,"w":854,"h":480},"normal":{"duration":118.376,"file_size":10177352,"w":640,"h":360},"ultra":{"duration":118.376,"file_size":17229362,"w":960,"h":540}},"is_encrypted":null,"sp":null,"md5":"16fcf0be0ffd6cd92ce8a96d523c32d9","tos_key":null,"secret_key":null,"encrypt_algorithm":null,"extra":null}}