Redness is a blush caused by a sudden rush of blood to the cheeks, which appears as a red mass with a thick center and faded surroundings. Often due to human sympathetic excitement, norepinephrine and other catecholamines secretion increase, so that the human heartbeat accelerates, capillary dilation caused. The following analysis of the characteristics of several pears: 1, Cuiguan pear sand pear, a kind of fruit nearly round, fruit shape index 0.96, yellow-green, snow-white flesh, tender flesh, crisp and juicy, slagging, stone cells are very few, taste thick sweet. Soluble solids content 12-14%, top quality, single fruit weight 200 grams, the maximum 500 grams, 96% edible rate of the fruit, listed in mid to late July, the fruit is flat and round, the fruit surface is clean, the flesh is white, the nucleus is small and thick, tender and cool, juicy taste sweet, sweet but not greasy, unique taste. 2, beer pear beer pear is the generic name of imported Western pear varieties, specifically subdivided into green beer pear, red beer pear, California beer pear, etc.. The total characteristics of the pear is the best taste after the fruit is soft, delicate and soft, sweet and juicy, the nucleus is very small. The fruit flesh is mostly ladybug or gourd-shaped, with various colors. 3.Southern fruit pear Southern fruit pear fruit is small, green-yellow skin, the sun side has a red halo. Fresh fruit is crisp, hard and sour, if placed at room temperature for about 15 days, the flesh will become soft and easy to dissolve in the mouth, the juice is particularly rich, the flavor is particularly strong. 4, balsam pear balsam pear scientific name kulle balsam pear, the fruit is small, fusiform or obovate. Peel green-yellow, the sun side has a red halo, thin skin. This kind of pear is high in sugar, crisp without dregs, strong fragrance. 5, duck pear fruit is obovate, the top has a duck head-like projection. General duck pear peel yellow-green, light yellow after storage. Bag cultivation of the fruit yellow-white, also known as crystal duck pear or crystal pear. Duck pear sugar is low, sweet and refreshing, and it is right to choose it to relieve grease. 6, snow pear yellow-green, the fruit surface is rough, the skin has waxy. The common pear on the market, it is the largest, each weighing about 350-400 grams. Its flesh is fine and crisp, juicy and sweet, with the most famous produced in Zhao County, Hebei. Snow pear has high medical value, has the effect of clearing heart and moistening lung, laxative, stopping cough and moistening dryness, waking up wine and detoxification, etc. 7.Crystal pear is a new variety of yellow pear selected and bred from new high branch bud transformation. The fruit is round or oblate, average single fruit weight 385 grams, maximum 560 grams. The skin of the fruit is creamy yellow when it is nearly ripe, the surface is crystal bright, with a sense of transparency, attractive appearance. The flesh is white, delicate, dense, tender and crisp, juicy, with soluble solids content of 14%, very few stone cells, small heart, honey-sweet taste, strong fragrance and excellent quality. The fruit is resistant to storage and transportation, and has a long shelf life.