坚固结构光学仪器用于测量水溶液的比重。
The sturdily constructed instrument optically measure specific gravity of aqueous solutions.
豁口或缺口，尤指位于或好象位于壕沟或要塞等坚固结构中的。
A gap or rift, especially in or as if in a solid structure such as a dike or fortification.
获得授权的不可食用产品提炼厂应当采用坚固结构，室内装修使用平滑、坚固和不可渗透的材料，并且能够进行清洁。
An authorized inedible rendering plant shall be of solid construction, with interior finishes of smooth, hard and impervious materials capable of being cleaned.
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