[机] chassis，undercarriage，underbed，underframe ；

[例句] 如果需要,发酵房还可以换成带烤车的底架. Instead of the proofer an under base trolley can be chosen.

[例句] 用途: 主要用于车辆底架及附件的装饰保护. Uses: coating for priming paint of automobiles and heavy metal.

thorough，thoroughgoing，downright，every inch，in grain ；

[例句] 这些火灾很可能会彻底毁掉这片土地上的森林。 The fires are likely to permanently deforest the land.

[例句] 彻底刷牙有助于口气清新。 A thorough brushing helps to freshen up your mouth.

[数]base，bottom margin，hemline ；

[例句] AB线是三角形abc的底边. Line AB is the base of the triangle ABC.

[例句] 这个三角形,底边的长度是20厘米. The base line of this triangle is 20 centimeters long.

[计] underscore，base line ；

[例句] 你必须搞清状况以及自己的底线。 You have to know what's what and when to draw the line.

[例句] 马丁内兹发球的时候通常站在底线处。 Martinez, when she served, usually stayed on the baseline.

subsoil，substratum ；

[例句] 蚯蚓深深地钻进底土. Earthworms burrow deep into the subsoil.

[例句] 进入底土的化学物质会减少，这对土质松软的热带土壤而言尤为重要。 Less chemical gets into the sub-soil which is particularly important with the light, tropical soils.

sole of the foot，basis pedunculi (cerebri)，crus cerebri，pes pedunculi，sole ；

[例句] 他赤裸的双脚脚面很光滑，脚底却很粗糙。 His bare feet were smooth on top and rough-skinned underneath.

[例句] 星期六下午，她脚底抹油，溜之大吉。 She sloped off quietly on Saturday afternoon.

betray a confidence，let out the whole story，give the show away，reveal the inside story ；

[例句] 这下子就露底了. Thus the whole thing came out.

[例句] 烫印面积较大的承印物, 可连续烫印两次, 可以避免发花 、 露底和烫印不上. Short - run larger substrate, twice continuously hot stamping, you can avoid hair flowers, threadbare and hot stamping.

nadir ；

[例句] 感觉上我们好像已从天底走到了天顶. It felt as if we had traveled from nadir to zenith.

[例句] 天底天球上,在观测者垂直向下的一点, 与天顶完全相对. A point on the celestial sphere directly below the observer, diametrically opposite the zenith.

negative，photographic plate，[化] negative film，negative plate ；

[例句] 在底片上把图像上部的这个不重要的细节涂抹掉. Block out this unimportant detail at the top of your picture.

[例句] 光对底片发生作用从而产生照片. Photographs are produced by the action of light on film.

in the final analysis，at bottom ；

[例句] 说到底，很少有人能这样无私。 Few people, when it comes down to it, are so selfless.

[例句] 也许这个人说到底品行并非那么完美。 Maybe this guy isn't so squeaky clean after all.

heelpiece，base wad ；

[例句] 丰田将其汽车出现的突然加速问题仅仅归咎于以下两个原因: 汽车底垫摆放位置不当以及油门踏板出现卡壳. Toyota has blamed sudden acceleration on just two causes: out - of - position floor mats and sticky accelerator pedals.

[医]primer ；

[例句] 用于不带底胶材料及其他材料的贴合. Non - use : with the end of the laminated plastic and other materials.

[例句] 此粘合剂由一种 单组分 液体底胶和 单组分 糊剂组成. It was composed of one - component liquid primer and one - component paste.

diapir，diapiric fold，piercement dome，piercing fold ；

[例句] 库车前陆盆地勘探程度较低,应注重寻找盐底辟构造,以及与其相关的圈闭. Searching salt diapers and related traps in Kuqa foreland basin is important.

[例句] 这种高地温线与该区上地幔的底辟上涌和岩石圈的相应减薄有关. The high geotherm the upper mantle diapir and the corresponding lithosphere thinning regions.

Normandy ；

[例句] 暑期他们乘船到更远的诺曼底和布列塔尼游览。 During their summer holidays they cruised further afield to Normandy and Brittany.

[例句] 尽管诺曼底的这个区域在战争中遭受了狂轰滥炸，但之后它已经被彻底重建了。 Although this part of Normandy was badly bombed during the war it has been completely reconstructed.

underside，[化] back surface ；

[例句] 袋子平整折起后，底面与一侧交叠。 When the bag is folded flat, the bag bottom overlaps one side of the bag.

[例句] 也可能是为了使油漆有个适宜底面. Alternatively it may be solely a method of forming a suitable background for painting.

alow ；

[例句] 水在船底晃来晃去. Water was slopping about in the bottom of the boat.

[例句] 铆工把薄金属板铆在船底上. The riveter riveted the metal sheets to the ship's bottom.

bottom ；

[例句] 底部的数字就是推荐的摄氏水温。 The number at the bottom is the recommended water temperature in Centigrade.

[例句] 海平面下降使白令海底部的浅层大陆架暴露出来。 Lowered sea levels exposed the shallow continental shelf beneath the Bering Sea.

foundation make-up ；

[例句] 在你用粉底和粉之间使用可以很好的定妆. Apply between your foundation and powder to perfectly set makeup.

[例句] 她美白的愿望如此强烈,完全听不进我的劝告,还是卖了最白的粉底. She was adamant in her decision and didn't take my advice.

ground ；

[例句] 适用于已涂有配套底漆的金属表面或其它推荐底材. Apply over primed metal , or other surface as recommended.

[例句] 与金属底材具有很好的附着力. Good adhesion to steel substrate.

[计] shade，shading ；

[例句] 如果该条目列在底纹中, 那么这个索引对于用户来说是失败的. If the entry is listed under shading, the index fails the user.

[例句] 首先, 底纹色彩的拔取给公道. First of all, the shading color that you want to add up.