The tooth enamel is softened by the acid and brushing straight after will wear the teeth down.
酸性物质会软化牙釉质，立即刷牙会磨损牙齿。
Likely cause: Known as bruxism, teeth-grinding varies from jaw clenching to ferocious grinding that wears teeth down to stumps. It is usually due to genetics or stress.
可能的诱发原因：虽说都叫磨牙症，但磨牙的情况各不相同，从牙关紧闭到疯狂磨牙直到牙齿只剩残根。磨牙通常是由遗传或压力造成的。
Poor tooth brushing techniques can harm your teeth - if you really scrub your teeth too hard, you will wear the sides of your teeth down, leaving V-shaped defects near the gum margins.
不恰当的刷牙方法会损害牙齿，如果你真的太用力刷牙，就会磨损牙齿边缘，在牙龈缘附近形成V字形缺口。
Pipe smokers sometimes wear down the tips of their teeth where they grip their pipes.
抽烟斗的人用牙齿咬住烟斗，有时会把牙齿尖磨平。
When cubs are hungry, they produce a grating fingernails-on-blackboard sound, with their lips pulledback from their teeth, to encourage their mother to lie down so they can nurse.
当幼仔饥饿时，它们会将嘴唇向牙齿后拉，发出指甲挠抓黑板般的尖锐叫声，以促使它们的母亲躺下来喂奶。
Grant spent seven hours trying to draw out the fish before he settled down on the bank to take a nap, having first passed the line through his teeth to make sure it did not escape.
格兰特花了七个小时试图在岸边停整午憩之前捕获它，接下来疲劳所致，不得已，他只好头一次把鱼线穿过自己的牙缝以保证它不会逃脱。
Jamie nodded, keeping his gaze down, hoping Dad didn't notice the way he gritted his teeth when he heard his older brother's name.
吉米点点头，把头低了下去。听到哥哥名字的时候他忍不住咬了咬牙，他可不希望被爸爸看到。
NASA said the crew had sent down video and photographs of a small star-shaped gear with two broken teeth. Experts were trying to determine whether it was related to the problem.
NASA说乘员已经下传了有关一个断了两个齿的小型星型齿轮的视频和图像。
Saliva acts as a barrier, protecting the teeth by neutralising acidic foods such as oranges, and the acid produced by bacteria as they break down foods.
而唾液正像一道保护牙齿的屏障，把橘子等酸性食物以及细菌分解食物产生的酸性物质中和掉。
She set about whittling down the likely candidates from the 150 who applied to a list short enough to interview personally - eliminating the ones who reassured her that they still had their own teeth.
她着手从150名提出申请的可能候选者中进行大幅删减，列成足够短的名单已备相亲——排除了那些向她保证自己不全是假牙的人。
It could be as simple as letting the cat out, turning out the lights, turning down the heat, washing your face, and brushing your teeth. Or it could be a series of yoga or meditation exercises.
这些事可以简单到放猫咪出门、关灯、关暖气、洗脸刷牙，也可以是瑜伽或冥想。
When he had things arranged on the table, he pulled the drill toward the dental chair and sat down to polish the false teeth.
桌上东西码好了，他就把牙钻拉到牙科椅边上，坐上椅子磨起假牙来。
Before I brush my teeth for bed, I write my top 10 list down in my trusty notebook.
在我刷牙睡觉前，我都会在我的笔记本上写下十项待办事宜。
"Well," he whispered, "I was walking down this road, armed to the teeth."
“这么回事，”他小声地说，“我沿着这条路走着，武装到牙齿。”
刷刷牙，上和下。
The long-awaited ruling in Bilski v. Kappos was finally handed down on Monday, giving you all some 66 meaty pages to sink your teeth into.
经过了长久等待，Bilski v.Kappos案的判决终于在周一作出。 法院给了你们所有人厚厚的66页判决书来啃。
Fluoride also helps teeth damaged from the decay process and breaks down bacteria on teeth.
氟化物也能帮助牙齿来自腐朽过程的损坏和牙齿中微生物的破坏。
My PALS clean their teeth up and down.
我的朋友们刷牙一上一下的呢。
You should slide the floss gently up-and-down between your teeth.
你应该轻轻地在牙缝处上下滑动牙线。
Insert the special cleaning thread between your teeth and pull it gently up and down.
把这条特制的棉线嵌在牙齿间，然后轻轻地上下移动。
When your teeth fall out in a dream, it could signify that you feel ill-equipped to break down the knowledge that you have available, that the way you break things down has changed.
当在梦中你的牙掉了，这可能意味着你并未充分准备好消化你所拥有的知识，或者你消化东西的方式发生了改变。
Viserion hissed again. Smoke rose between his teeth, and deep down in his throat they could see gold fire churning.
韦赛里昂又发出了丝丝声。烟从他的齿缝中溢出，而在他喉咙的深处，能看见金色火焰的扰动。
She came down to breakfast in a hurry, not having brushed her teeth.
她匆匆忙忙地下楼吃早饭，连牙也没刷。
Last year an employee said he couldn't come in because his false teeth flew out the window while he was driving down the highway.
去年，有一名员工称他不能上班的原因是，他在高速公里上开车的时候，假牙从车窗了飞出去了。
What powerful people I have not seen, "Woods with two pairs of steel teeth up and down to knock out a few times, said, "Who can challenge my steel teeth!
什么厉害人物我钢牙没见过，”呜兹将上下两对钢牙铛铛地磕打了几下，说“谁能敌得过我的钢牙！”
It would be necessary to "grind down" the size of these abutment teeth to prepare them for crowns.
需要将作桥墩的牙磨掉一些，准备套上金牙冠。
刷我的牙齿，上上下下。
刷我的牙齿，上上下下。
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