材料丢失，不予补发。

The material will not be reissued if lost.

《新英汉大辞典》

由于有关此案的材料全部丢失，进一步的调查受到了阻碍。

Further investigation was hindered by the loss of all documentation on the case.

《柯林斯英汉双解大词典》

为了不丢失那些非常重要的点，你可以使用一些明亮、有趣的颜色标志来记录这些材料。

In order not to lose those very important points, you can use some bright, fun color signs to record these materials.

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