使用地坪打磨机和无尘封闭手提磨机去除表面粗糙物，并提供涂装对表面所要求的粗糙度。
Carry out surface preparation by grinder and dust free self-enclosed portable grinder until to remove surface laitance and provide sound and textured surface.
那是一个大约25英尺（8米）长的圆形突出物，背部呈黑灰色、粗糙、好似象皮，逆着水流翻搅了一阵子之后，就消失了。
It was a hump about 25 feet (8 metres) long, covered with rough dark-grey hide like an elephant’s back. The creature it belonged to ploughed against the current for a while, and then disappeared.
随着时间过去，大蒜中的粗糙的有刺激的复合物自然转换稳定的，安全的硫化合物。
Over this time period the harsh and irritating compounds in garlic are converted naturally into stable and safe sulfur compounds.
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