材料丢失，不予补发。
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.
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.
这块丢失的铯-137可能埋在一个废置场，压在几吨废金属下面；当地官员认为这块材料可能已经被熔化了。 。
Thee Caesium-137 may be buried in a scrap yard under tonnes of metal, and local officials believe it could have been melted down.
由于甜菜的高度自交不亲和性，常导致优良植株基因型的丢失，给优良育种材料的保存带来了很大的困难。
Since high degree of sugar beet self-incompatibility, it often leads to loss of fine individual genotype, and is hard to keep good breeding material for breeding.
特别是自交高度不亲和性，往往使得优良单株基因型很容易丢失，给优良品种选育材料的繁殖和保存带来了极大困难。
Especially, what self-crossing is highly no appetency makes easy lose of good single genotype, which propagatation and conservation of good varieties breeding brings great difficulty.
特别是自交高度不亲和性，往往使得优良单株基因型很容易丢失，给优良品种选育材料的繁殖和保存带来了极大困难。
Especially, what self-crossing is highly no appetency makes easy lose of good single genotype, which propagatation and conservation of good varieties breeding brings great difficulty.
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