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用英语介绍牙膏
最佳答案：
Toothpaste is a common oral hygiene product used to clean and protect teeth. Here is an introduction to toothpaste in English:
# Definition and Basic Information
Toothpaste is a gel or paste substance used in conjunction with a toothbrush to clean teeth. It comes in various flavors, such as mint, strawberry, and lemon, to make the brushing experience more pleasant.
# Composition
- Abrasive Agents: They are the main components of toothpaste, accounting for about 20% - 60% of the total composition. Common abrasive agents include dicalcium phosphate dihydrate and aluminum hydroxide. Their main function is to increase friction, which helps to clean and polish the teeth, removing stains and plaque on the tooth surface.
- Humectants: Such as glycerin and sorbitol, which keep the toothpaste moist and glossy in the tube.
- Surfactants: Like sodium lauryl sulfate, which can quickly form bubbles in the mouth and play a role in cleaning dirt.
- Thickeners: Such as guar gum and carboxymethyl cellulose, which make the toothpaste easy to squeeze out without flowing freely like water.
- Sweeteners: Some manufacturers add saccharin or other sugars to improve the taste of the toothpaste, masking the bitter taste of other ingredients.
- Preservatives: They prevent bacterial growth and extend the shelf life of toothpaste.
- Active Additives: Different ingredients are added according to different required effects. For example, fluoride is added to fluoride toothpaste to prevent tooth decay. Chlorophyll may be included in herbal toothpaste to prevent gum bleeding and bad breath.
- Flavorings and Pigments: They make the toothpaste more attractive, enhancing its visual appeal and flavor to attract consumers.
# Functions
- Plaque Removal: Through physical friction and chemical reactions, toothpaste can remove bacteria and food debris on the tooth surface.
- Gum Bleeding Reduction: Some toothpaste contains anti-inflammatory ingredients that help reduce gum inflammation and bleeding.
- Tooth Enamel Strengthening: Fluoride in toothpaste can help prevent the development of tooth decay by strengthening the hard layer of teeth.
- Fresh Breath Provision: Certain flavorings in toothpaste can improve bad breath, leaving the mouth feeling fresh.
# Usage Methods
- Amount: Squeeze out an appropriate amount of toothpaste, usually about the size of a pea, onto a clean toothbrush.
- Brushing Technique: Place the toothbrush head on the teeth at a 45-degree angle and gently brush the teeth and gums back and forth. Make sure to brush each tooth on both the inside and outside.
- Duration: Brush for at least two minutes to thoroughly clean the teeth and mouth.
- Frequency: Brush your teeth at least twice a day, in the morning and before going to bed at night. It is also a good habit to brush after meals if possible.
求吹糖人的英文资料
吹糖人的是旧京一个行业，小贩们肩挑挑子走街串巷，挑子一头是一个带架的长方柜，柜子下面有一半圆形开口木圆笼，里面有一个小炭炉，炉上有一个大勺，中间放满了糖稀(据说是麦芽糖溶化所得)。木架分为两层，每层都有很多小插孔，为的是插放糖人。这玩艺儿好看、好玩，玩完后还能吃，一般孩子都喜欢，见着就走不动了，不是缠着大人要买，就是跑回家去要钱，实在没钱的也不肯离去，眼巴巴地盯着这些糖人。有的小孩图快，就付钱买一个现成的；有的则指定形状要求现做。这时，小贩就用小铲取一点热糖稀，放在沾满滑石粉的手上揉搓，然后用嘴衔一段，待吹起泡后，迅速放在涂有滑石粉的木模内，用力一吹，稍过一会儿，打开木模，所要的糖人就吹好了。再用苇杆一头沾点糖稀贴在糖人上，就大功告成了。糖人有各种形状，什么小鹿、金鱼、耗子、灯笼等，最惹孩子喜爱的是孙猴。孙猴做好后，要在猴背上敲一小洞倒人些糖稀，再在猴屁股上扎一小孔，让糖浆慢慢地流出来，下面用一个小江米碗接着，用小江米勺舀碗里的糖稀吃，直到糖稀流完或冷却凝固时，则连糖人孙猴以及江米碗、勺一块吃掉。这套玩艺儿称为猴拉稀，最受孩子们欢迎，不过价格要比其他糖人贵一些。
听老人讲，早些年有走街串巷吹糖人的，为了让生意好做，糖人可以不必用钱来买，而是用牙膏皮来换。两筒牙膏皮可以换一个孙猴或是其他的小糖人。这一着颇受儿童欢迎，常常有小孩子把家里没有用完的牙膏挤出来，用牙膏皮去换糖人吃，即便挨打也觉着甜滋滋的。想来这是计划经济难得一见的好处之一，只可惜现在经济发展了，牙膏皮也就不那么紧缺了。现在，恐怕不少老人只能对扔到垃圾堆里的牙膏皮报以苦涩的一笑了。
