This is because toothpaste contains fluoride.

Involves the analysis and designing of toothbrush in ergonomic aspect.

主要论述牙刷在人机工程学方面的分析与设计。

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An old toothbrush works great for this.

旧牙刷可以很好的发挥作用。

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The toothbrush. I got it, all right.

牙刷我拿了没事了。

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You won't need your toothbrush. we'll take care of everything.

你不用带牙刷，一切我们都会准备好的。

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Therefore, toothbrushes come in at number five on this top ten list.

综上所述，我们将牙刷排名榜单中列。

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Couldn't you carry it with you like a toothbrush?

你就不能象带牙刷一样带着么？

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This toothbrush could clean teeth quickly and well.

这种牙刷可以又快又好的清洁牙齿。

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Use a quality electric toothbrush to effectively massage your gums.

使用质量比较好的电动牙刷，有效按摩牙龈。

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The primeval report for treatment of oral disease by using magnetic toothbrush

磁性牙刷治疗口腔疾病的初步报告

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I change my toothbrush every three months.

我每三个月更换一次牙刷。

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Objective: To observe the oral care effects of finger toothbrush.

目的：探讨指套牙刷的口腔保健作用。

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Because I finished making this toothbrush helmet three years ago,

因为3年前我做出了这个头盔，

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I also did something very bad to your toothbrush.

我还对你的牙刷做了一件不好的事情。

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When do you use your toothbrush every day?

你每天什么时候用你的牙刷？

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Like toothbrushes, seem to have become used to be every day things;

像牙刷，似乎成了每天必须用到的东西；

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Determined of the content of free fluorine in 16 different toothbrush

16种牙膏中游离氟含量的测定

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Experimental study on the oral care effects of a finger toothbrush

指套牙刷口腔保健作用的试验观察

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You should get a new toothbrush every few months.

你应该每几个月换一只新的牙刷。

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I need to buy a toothbrush.

我需要买牙刷。

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She placed a towel on a cluster of rocks just clear of the tidemark

她把一条毛巾放在刚没过涨潮线的一堆石头上。

柯林斯高阶英汉双解学习词典