这儿有一个例子，我们经常面对公共和私营运输困难。

Here's an example. We often face difficulties with both public and private transport.

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而且笨重造成运输困难，凝胶时间长，除非需要浓度非常高的胶体。

It is also bulky to transport and needs long gelling times unless used at very high concentrations.

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二氧化氯是目前广泛使用的消毒剂，但存在稳定性差、贮存运输困难、易挥发等缺点。

Chlorine dioxide is the optimum disinfectant to be used widely at present, but it has several shortages in stability, storage, transport and volatilization.

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