坚硬的

A glaze is a form of slip that turns to a glasslike finish during high-temperature firing. When a slip was not applied, the vessel was allowed to dry slowly until the external surface was almost like leather in texture.

解析：根据原文的线索追踪，发觉在烘干后到外表呈皮革状的质地，然后用圆石或者类似的物体来打磨成光亮、坚硬的表面，于是答案就是一个&打磨&的过程，答案就是D。

There is booming rain, whispery rain, rain that tells you to sleep, and rain on the leaves which sings you awake; there is soft rain, hard rain, sideway rain, rain that makes you instantly wet, and rain that leaves soft kisses on your cheek, like the wings to a butterfly.

有暴雨，有细雨，雨伴你人眠，雨滴落叶像唱歌唤醒你；有温柔的雨，有坚硬的雨，有斜斜的雨，雨顷刻淋湿你，也像蝴蝶的翅膀轻吻上你的面颊。

That is to say, less and less of the sea will remain hospitable for calcifying organisms.

在早年的研究中，许多科学家判断，海洋酸化问题不大，因为至少对方解石而言，表层水仍然保持过饱和，而方解石是最坚硬的一种碳酸钙。1990年代，迈阿密大学的海洋生物学家兰敦进行了一项精妙的实验，来验证科学家的猜测。

Other compounds include the nitrides, exceptionally hard materials made from nitrogen and a metal; cyanides; azides, used in detonators and percussion caps; and thousands of organic compounds containing nitrogen in functional groups or in a linear or ring structure.

其它的化合物包括氮化物，是由氮和金属生成的异常坚硬的材料；氰化物；叠氮化物，用作引爆剂和雷管；还有数千种含氮的有机化合物，以功能团或者线性或环状结构的形式存在。

Their powerful beaks scraped the gooses wings from top to bottom,scuttled under its wings and rode up its body,chipping off the ice held in the feathers.

于是，只见4只天鹅飞到它的身旁，用坚硬的长喙上上下下里里外外地蹭它的翅膀，拱它的身体，啄掉它羽毛里的冰块。

"In essence, Miss Granger, I own you." He leered, glancing at her lips and pressing his granite hips against her soft tummy."I hadn't thought about having a personal sex slave. But if you are volunteering for the position, I would be more than happy to accept your offer."

&基本上，Granger小姐，我拥有你&，他诱惑的看着她，扫过她的嘴唇并把自己坚硬的下身推向她柔软的肚子，&我没有想过拥有一个私人性奴隶，但如果你志愿于这个职位，我很高兴接受你的要求。&

Duct Burners Duct burners, tiring oil and/or natural gas, are used to preheat the primary air stream which in turn preheats the bed material to the temperature needed for solid fuel combustion.

管火炉 管火炉、麻烦的油以及/或天然气，用来预先加热依次预先加热对温度对坚硬的燃料燃烧的需要床材料的主要的空气水流。

Bottom, scuttled under its wings and rode up its body, chippingoff the ice held in the feathers.

于是，只见4只天鹅飞到它的身旁，用坚硬的长喙上上下下里里外外地噌它的翅膀，拱它的身体，啄掉它羽毛里的冰块。

Their powerful beaks scraped the goose's wings from top to bottom,scuttled under its wings and rode up its body,chipping off the ice held in the feathers.

于是，只见4只天鹅飞到它的身旁，用坚硬的长喙上上下下里里外外地蹭它的翅膀，拱它的身体，啄掉它羽毛里的冰块。

Their powerful beaks scraped the goose's wings from top to bottom, scuttled under its wings and rode up its body, chipping off the ice held in the feathers.

于是，只见4只天鹅飞到它的身旁，用坚硬的长喙上上下下里里外外地噌它的翅膀，拱它的身体，啄掉它羽毛里的冰块。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。