此外，线路的改造也很复杂，而目前我国一些线路受条件限制难以改造。
It needs substantive money and rebuilding railway is complex. It is difficult to rebuild some railways in our country.
如受条件限制需求布置时，应契合现行的建筑防火、建筑隔声及相关标准的规则。
Subject to conditions such as the layout requirements, they should fit the existing fire protection, building insulation and related Standards.
UDI由两部分组成：强制性的器械标识符(DI)和受条件限制的生产标识符(PI)。
Two parts form the UDI: the mandatory device identifier (di) and the conditional production identifier (PI).
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