求翻译：堆放时，如有必要，负载可由平铺的质量为500g试验包构成具有100 mm X 100 mm底面的包堆来完成，然后再采用底面为50 mm X 100 mm、质量为125 g的试验包水平堆放，而4个125 g的试验包可用一个垂直放置的质量为500g试验包来代替。是什么意思？

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 When stacked, and if necessary, the load can be tiled, quality of 500 G test packages constitute a 100 mm X 100mm bottom side of the package, and then use the bottom side of 50 mm X 100 MM, quality is 125 G of test level stack, and 4 125 G of the test packages are available in a vertical position

When  stack, like has the necessity, the load may be a 500g experiment package of constitution has 100 mm by the even shop quality X 100 mm bottom surface package pile to complete, then uses the bottom surface is again 50 mm X 100 mm, the quality is 125 g experimental package of level stacks, but 4

• Stacked Shi, as has necessary, load can by tile of quality for 500g test package constitute has 100 mm x 100 mm late surface of package heap to completed, then again used late surface for 50 mm x 100 mm, and quality for 125 g of test package level stacked, and 4 a 125 g of test package available a

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