皮衣是不可水洗的，可以送去干洗店干洗。
皮衣保养五要点：
1.要避免皮衣接触油污、酸性和碱性等物质，脱下时把皮衣放在通风处，但不能暴晒；
2.如果遇到雨淋，可用软干布擦去水渍，但千万不要用水和汽油涂擦，因为水会使皮革变硬，汽油能使皮革的油分挥发而干裂；
3.皮衣换季收藏前一定要清洗上光，使皮衣保持柔软细滑有光泽，延长寿命；
4.收藏时挂起来，皮衣外罩一块布，不要折叠，防止皮衣出现皱纹；
5.皮衣如有撕裂或破损时，应及时进行修补。
Dogs are one of the most popular pets in the world. They are known for their loyalty, intelligence, and friendly nature. Dogs come in many different breeds, each with their own unique characteristics.
One of the most popular breeds is the Labrador Retriever. They are known for their friendly and outgoing personalities, and are often used as service dogs. Another popular breed is the German Shepherd, which is known for their intelligence and loyalty. They are often used as police dogs or as guard dogs.
Dogs are also great companions for people of all ages. They are known to reduce stress and anxiety, and can even help lower blood pressure. They are also great for families with children, as they are patient and protective.
Taking care of a dog requires a lot of responsibility. They need to be fed, exercised, and given regular check-ups at the vet. They also need to be trained and socialized properly to ensure they are well-behaved and obedient.
In conclusion, dogs are wonderful pets that bring joy and companionship to many people. They are loyal, intelligent, and friendly, and make great companions for people of all ages.
狗看东西黑白灰色。
颜色由狗眼的结构所决定的，眼球中的视锥细胞是捕捉颜色的关键，狗眼视网膜中的这种视锥细胞的数量要比人眼中的少。
在辨别灰色时狗却要比人强得多，狗眼中的另一种视觉细胞是视杆细胞，对光的感受能力很强。
狗是昼夜都活动的动物，因此需要在任何条件下都能看到周围的环境。
在黑暗中，狗的视力要比人强3到4倍，狗的视网膜分成上下两部分，上部能在黑暗的情况下对周围的环境进行识别，而下部含有黑色的色素，可以吸收多余的光线。