That is, the junction between the surface of the book block and the back of the book. It is also the junction of the book shell and the back of the book before and after the hardcover. The spine of a paperback book is flush, and the surface of the book block is perpendicular to the back of the book; the spine of a hardcover book is higher than the surface of the book block.
The first picture above is a round back without ridges, the second is a round back with ridges
The role of bath dew:
(1) the shower gel has a clean skin effectThe basic effect of bath lotion is to dissolve and remove the dirt and grease from the skin and pores, and keep the skin clean and clean, not damaged by dirty dirt, and prevent skin pores from clogged and cause some skin problems to appear.
(2) the shower gel has the effect of whiteningThe shower gel also has the effect of whitening the skin, and when using the shower lotion, the effective composition of the body will quickly penetrate the skin, highlight the skin color and make the skin more white. And the cleaning effect of bathing is also a way to avoid the accumulation of dirty things and cause the skin to be dull.
(3) the shower gel has a moisturizing effectSome of the ingredients of the lotion, such as honey, are added to the shower gel, and the skin will not be dried by the strong cleaning force, but it will also feel very moist, so that the immune system will not destroy the skin surface of the skin, which is very mild, and is suitable for those who are sensitive to the skin.
(4) the shower gel has the effect of sterilizationIn addition to cleaning, bathing lotion can also kill bacteria, often use bath lotion to prevent harmful bacteria from causing damage to the skin or body, and can be used to prevent the effects of some skin diseases.
(5) the shower gel has a role in regulating the moodNow many of the bathing dew will add spices to the people who use the shower gel to enjoy the aroma of the skin while cleaning the skin, and some of the shower gel is still fragrant after use. These subtle aromas can help regulate people's moods, relieve stress, and sweep away the gloom.
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