求翻译：但是由于das和dak基因序列都比较长，在现有经典农杆菌的双元载体中没有适合的酶切位点可用于构建这两个基因的植物表达载体。是什么意思？

However, due to das and dak gene sequences longer than the existing classical Agrobacterium binary vector is not suitable restriction sites of these two genes can be used to build the plant expression vector.

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But because das and the dak gene sequence quite is all long, the suitable enzyme has not cut the position spot at in the existing classical agricultural bacillus binary cell carrier available in to construct these two genes the plant to express the carrier.

But the DAS and Dak gene sequence is rather long, existing classic Agrobacterium binary vectors for restriction point is not available for building these two gene plant expression vectors.

However, due to das and dak gene sequences longer than the existing classical Agrobacterium binary vector is not suitable restriction sites of these two genes can be used to build the plant expression vector.