如果必须采取化学或者物理保护方法处理，要选择应用最温和的处理方法。不能采用会损害历史材料的处理方法。
Chemical or physical treatments, if appropriate, will be undertaken using the gentlest means possible. Treatments that cause damage to historic materials will not be used.
如果必须采取化学或者物理保护方法处理，要选择应用最温和的处理方法。不能采用会损害历史材料的处理方法。
Chemical or physical treatments, if appropriate, will be undertaken using the gentlest means possible. Treatments that cause damage to historic materials will not be used.
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