One useful clarification might be to stress that the notion of proportionality here is not only concerned with cost and expense but that the significance of the gravity or otherwise of the breach, relative to the difficulty of restoring the status quo ante, must also be taken into account.
澄清后，可以强调成比例的概念在这里不仅指成本和费用，而且还必须考虑不法行为的轻重以及恢复原状的困难。