Chemical gels have good stability and mechanical strength, but it is difficult for them to perform a sol-gel transition.
化学凝胶具有较好的稳定性和强度，但难以实现凝胶-溶胶的可逆转变。
The results showed that the systems underwent the sol-gel transition with the increase and decrease of the temperature.
结果表明：体系的温度升高和降低时，凝胶可发生热可逆溶胶-凝胶相互转变；
The results showed that the systems underwent the sol-gel transition with the increase and decrease of the temperature.
结果表明：体系的温度升高和降低时，凝胶可发生热可逆溶胶-凝胶相互转变；
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