When it comes to shipping materials, its not always the perfect substitute for Styrofoam or other plastics.

说到运输材料，它并不总是泡沫塑料或其他塑料的完美替代品。

Don't worry, Claire. The ads say the energy bar contains all the nutrients you've mentioned. They say it can be a perfect substitute for daily meals.

别担心，克莱尔。广告上说能量条包含了你提到的所有营养物质。他们说它可以是日常饮食的完美替代品。