这种忠于职守的精神是难以取代的。

That loyalty is hard to replace.

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辐射育种既是常规育种的重要补充，又是常规育种难以取代的手段。

The radioactive breeding is not only the important supplement of the conventional breeding, but also the method which the conventional breeding could not substitutes.

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毕竟那些唯有时间才得以萃练成的陈酒香气与圆融协调的口感是如此地迷人与难以取代。

Only after all that time was able to excel at stripping the aged wine aroma and taste coordinated harmony is so fascinating and difficult to replace.

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