既存在无意识地、根深蒂固的自我限制，又存在有意识地、选择性自我限制。
厂商们采纳的这种标准事实上是限制竞争的：厂商自我限制了其使用其它材料的能力，同时也限制了消费者的选择范围。
The agreement to adopt the standard is restrictive: the manufacturers have limited their own ability to use other materials, and they have limited consumer choice.
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