lower tooth

Japan If it is a lower baby tooth, throw it up onto the roof; and if it is an upper tooth, throw it underneath the 'en-no-shita' ( the lower portion below the floor of a Japanese house).

在日本，如果掉的是下牙，就扔到房顶上去；如果是上牙，就放在外廊地板下面。

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If either the number of sun or ring gear is not multiple of planet gear, system will run effectively, with lower impaction of tooth mesh in and out.

行星轮与内齿圈齿数不为行星轮个数的整数被时，轮齿的啮入、啮出对系统的冲击小，系统的效率高。

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This tooth on the lower jaw is sensitive to cold and hot.

下腭上的这颗牙齿对冷热很敏感.

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It is done so that the upper tooth grows healthy downwards, while the lower tooth upwards.

这样是为了让上牙向下长，下牙向上长。

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Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.

不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。

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In Japan, children throw a lower baby tooth up onto the roof so the next tooth grows healthily upwards;

在日本，孩子会把下齿的乳牙放到房顶上，这样的话下颗牙将会长得结结实实；

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The upper and lower jaws possess straight tooth rows and the jaw arches are almost rectangular in shape.

上、下颌具有直的齿列，而颌弓几乎呈直角形。

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Steel tooth bit can increase the bit's stability and lower the tooth impact load, and enhance its wear resistance.

钢齿牙轮钻头增强了工作的平稳性，降低了牙齿的冲击载荷，使牙轮钻头的耐磨性能得到提高；

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This tooth on the lower jaw is sensitive to heat and hot.

下颌的这颗牙对冷热很敏感.

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The results show that in the case of the same cutting resistance, pick-shaped teeth enjoys advantages over knife-shaped teeth, as a result of it better combined performances, such as freedom of fragment, the lower tooth cost and wear-proof.

结果表明：在截割阻力相同的情况下，镐形齿具有不易被击碎、齿耗低、耐磨等优点，其综合性能优于刀形齿。

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Fluoride at lower concentrations is used in tooth paste, instant tea

低浓度的氟化物用于牙膏，速溶茶

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