英语作文的优美文摘
英语作文的优美文摘
想要提高英语作文的水平就是要多多积累英语文章哦，小编今天给大家整理了英语的文摘，只要我们认真的学习这样才可以快速的提高成绩，所以同学们快点学习起来吧，有需要的可以收藏起来哦
细菌钟爱你的嘴
Bacteria Loves Your Mouth
细菌钟爱你的嘴
Did you know that there could be more bacteria living in your mouth than there are people on earth?
你知道吗，寄居于你口中的细菌有可能比全世界的人口数还多?
Bacteria love our mouths because the livin’ is easy–there’s plenty of food and water, and a fairly constant temperature of 95 degrees. The vast majority of these bacteria don’t cause any problems. Some even do community service, cleaning out the food between our teeth without harming the teeth at all!
细菌钟爱我们的嘴是因为口腔中的环境很舒适，不仅有充足的食物及水，其温度也稳定在95华氏度。口腔内绝大多数的细菌不会产生什么问题。有一部分甚至是有益的，义务清理牙缝中的食物残渣，保护我们的牙齿!
But there is one type of bacteria that wreaks havoc in the mouth by causing cavities. Like most people, the bacterium streptococcus mutans loves to eat sugar. In the process, it converts sugar to an acid that corrodes teeth and causes cavities. Saliva can neutralize some of that acid and prevent it from damaging teeth.
但是有一种细菌会对口腔形成危害，造成蛀牙。细菌中的变形链球菌与许多人一样喜爱吃糖，通过将糖转化为酸，进而腐蚀牙齿，形成蛀洞。唾液能够中和部分酸以防牙齿被损害。
But these days, most of us eat so much sugar that our saliva can’t neutralize all the acid that streptococcus mutans produces.
然而现在大部分人摄入的糖分过多，以至于唾液无法中和所有的酸，变形链球菌随即而生。
What’s a sugar addict to do?
那么爱吃糖的人该怎么办呢
If you brush and floss every day, that physically disrupts the colonies of bacteria enough to keep the populations under control, somewhere between one thousand and one hundred thousand per tooth. The fluoride in toothpaste and tap water hardens tooth enamel, making it more resistant to the acid produced by streptococcus mutans.
如果你每天刷牙并使用牙线清理牙齿，可有效阻断细菌繁殖，将每颗牙的细菌数控制在一千至十万。牙膏中的氟化物及自来水也能够坚固牙釉质，使牙齿更好的抵御变形链球菌所产生的酸。
Fluoride also helps saliva repair parts of the tooth that have already been damaged by the acid. And, last but not least, it helps not to feed the critters too much of their favorite food: sugar!
氟化物还能够帮助唾液修复被酸损害的部分牙齿。最重要的一点就是不要给细菌它们的最爱——糖。
石英计时
Keeping Time With Quartz
石英计时
Most people know that wrist watches commonly contain quartz. In fact, if you wear a watch, chances are it’s a quartz watch, since most watches is made today use quartz. But, you may not know what quartz has to do with keeping time.
大多数人都知道通常腕表内含有石英。事实上，只要你带表，那基本上都是石英表，因为当今通用的多数表都由石英制造。但是，你可能不知道石英与计时之间有何关联。
Quartz is a mineral, otherwise known as silicon dioxide, which is common in the earth’s crust, and the main ingredient of sand. This mineral is popular with watch manufacturers because it vibrates quickly when electrically stimulated, and loses little energy when vibrating.
石英是一种矿物质，也就是二氧化硅，通常存在于地壳中，同时也是沙子的主要成分。石英常被用于制作钟表是因为这种矿物质在受到电刺激后会快速摆动，而摆动过程中的能量损耗很小。
The steady vibrations are what allow a watch to keep time. The quartz used in watches is actually synthetic, because it vibrates more steadily than natural quartz.
这种平稳的摆动就是手表计时的奥妙所在。手表所用的石英实际上是合成的，合成石英比自然石英摆动得更为稳定。
Here’s how a quartz watch works. A small, paper-thin piece of synthetic quartz acts as the watch’s oscillator. Think of the oscillator like the pendulum in a grandfather clock, that by its continuous motion tells the watch how much time has passed. The oscillator is a sort of counter which ticks off the seconds, minutes and hours, and the watch displays the time counted.
现在让我们来探寻石英手表的工作原理。微小如纸薄的合成石英相当于手表的振荡器。这种振荡器如同座钟的钟摆，通过它不间断的摆动反馈到手表来提示时间。振荡器是一种标记秒、分及小时的计算器，而手表则显示出所记时间。
When the quartz oscillator receives an electrical charge from a battery or some other power source, it vibrates at over 32,000 times per second. As it vibrates, an integrated circuit in the watch programmed to know the oscillator’s frequency regulates the vibrations so that a certain number of them equals one second.
当石英振荡器接收到来自电池或其他电源的电荷时，它将以超过32,000次/秒的频率摆动。摆动过程中，通过编程手表中的集成电路来测定振动器的频率，进而调整摆动，以达到固定摆动次数为一秒。
If the watch has a minute and second hand, the regulated electrical pulses are changed into mechanical pulses that move gears and set the watch hands in motion. If the watch is digital, the quartz’s electrical impulses add up to minutes, hours, and days.
如果手表有分针和时针，设置好的电脉冲可转换成机械脉冲，推动齿轮转动进而带动指针运动。若是电子手表，石英的电脉冲可累计成分钟、小时及天数。
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