大多数罗马陶器轻巧而光滑，摸起来很硬，但像所有的陶器一样，如果掉在坚硬的物质上就会碎裂。
Most Roman pottery is light and smooth to touch and very tough, although, like all pottery, it shatters if dropped on a hard surface.
把本来结实又坚硬的胡萝卜放进开水后，它们便变得又光滑又柔软。
The strong and hard carrots became soft and weak after they were put into the boiling water.
鱼鳍坚硬、光滑且细窄，这些特性也有助于减少阻力。
The fins are stiff, smooth, and narrow, qualities that also help cut drag.
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