他们的牙齿是平的。
The study cautioned children against eating too much chocolate, which may destroy their teeth.
这项研究警告孩子说不要吃太多巧克力，因为这可能毁掉他们的牙齿。
The married women of Shitamachi maintained the custom of blackening their teeth.
下町的已婚妇女保留了染黑牙齿的习俗。
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。
This is how crocodiles clean their teeth.
鳄鱼就是这样清洁牙齿的。
Are Asians more likely to floss their teeth?
亚洲人用牙线清洁牙齿的比例更高吗？
Do you know that most people do not brush their teeth in the right way?
你知道大多数人刷牙的方式不对吗？
In the south of Africa, some people brush their teeth with sticks first.
在非洲南部，有些人先用棍子刷牙。
Some people brush their teeth with sticks first according to the passage.
这篇文章说，有些人先用棍子刷牙。
A century ago, few people regularly brushed their teeth multiple times a day.
一个世纪以前，很少有人一天刷几次牙。
They are actually baring their teeth.
但实际上，他们只是不想露牙而已。
我看他们的牙齿。
My PALS clean their teeth up and down.
我的朋友们刷牙一上一下的呢。
The authorities, too, are baring their teeth.
权威部门也露出了他们的牙齿。
Passing sticks through their teeth is forbidden.
用棍棒穿过他们的牙齿是禁止的。
Sunset, heartbroken people brush their teeth.
夕阳西下，断肠人在刷牙。
People try to pick up apples with their teeth.
人们试图用牙齿捡苹果。
Some people grit their teeth during their sleep.
有些人睡觉时磨牙。
Maybe this is the way sea lions brush their teeth.
也许这是它们刷牙的方式。
Most men know that brushing their teeth is important.
很多人都知道刷牙很重要。
Some people assume they will lose their teeth as they age.
一些人认为到一定年龄牙齿就会脱落。
Dogs show their teeth to warn, wag their tails to welcome.
狗露出牙时表示警告，摇摇尾巴则表示欢迎。
When patients like their teeth, they take care of their teeth.
病人喜欢他们的牙齿，就会呵护他们的牙齿。
Oh, look! The cats are brushing their teeth with the Harmonica.
噢，瞧！猫咪们正在用口琴刷牙。
Oh, look! The cats are brushing their teeth with the Harmonica.
噢，瞧！猫咪们正在用口琴刷牙。
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