First, the bed
The bed, also known as the bed, is a tool for sleeping. The bed has been in China for more than 2,500 years. From the fire in the north to the rattan beds in the south, from the cradle of children to the loungers of the elderly, there are countless types of beds. With the advancement of society and the development of science, the function of the bed is also increasing. From the perspective of hygiene care, the bed should have the following elements no matter how it changes:
(1) The bed should be moderately low
"Old and old Hengyan" said: "The bed is low and it is easy to sleep." It is recommended that the height of the bed is slightly higher than the knee level of the sleeping person, which is about 0.4 to 0.5 m. This height is convenient for getting in and out of bed. If the bed is too high, it will easily cause people to feel the tension and sleep; if the bed is too low, it will be easy to get wet, so that the cold, damp and hot places will be in the air, or cause joint cramps. Sleeping on a bed that is too low, often does not breathe fresh air, dust, carbon dioxide, and affect health. It can be seen that the bed is too high and the floor is not good for health.
"The service is popular" contains: "The eight-foot trampoline, the bed will be wide." The bed area is large, and it is easy to freely turn over during sleep, which is conducive to blood circulation and bone stretch. In general, the bed should be longer than the length of the sleeping person by 0.2 to 0.3 m, and the width of the bed is 0.4 to 0.5 m. For athletes to apply special beds, the length and width can be met. In addition to the required length, the crib should be railed at the bed to prevent the baby from falling to the ground.
(3) The bed should be soft and moderate
The standard hardness is preferably 0.1 m thick cotton pad on a wooden bed. The beds on the ground, such as the bamboo beds, rattan beds and brown trampolines in the south, are also in line with the health requirements. Modern spring wire beds, sofa beds, and Simmons have the disadvantage of being too elastic and too soft. This can be corrected by a soft bed. The moderately soft bed ensures that the spine maintains a normal physiological curve, relaxes the muscles, and helps to restore fatigue. A soft bed can increase the load on the ligaments and vertebrae around the spine, and the muscles are passively stressed, causing low back pain for a long time.
Traffic lights are traffic lights that command traffic and are generally made up of red lights,green lights and yellow lights.The red light means no traffic,the green light is allowed to pass,and the yellow light is a warning.
Traffic lights are divided into:light motor vehicles, no-motor vehicles lights,pedestrian signal lights,direction indicator lamp(arrow lights),driveway lights,flashing warning lights,road and rail light plane crossing.
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