这些要求的目的是在储存，搬运和运输过程中确保设备的质量。
The purpose of these requirements is to preserve the quality of equipment during storage.
ST型缓冲器是铁路车辆运输过程中用于抗冲击的关键部件，推力锥作为其中的主要传力零件，其精度和表面质量要求都非常高。
ST bumper used to resist shock is a pivotal part in railway vehicle transportation. As primary load-transfer component of this part, thrust cone required very high precision and surface quality.
虽然在建筑质量的坚固性和封堵的严密性上不及永久密闭，但在矿井通风中若无法满足运输及时间的要求时，临时密闭可发挥其自身的独特作用。
Although the airtight is not as solid and tight as permanent airtight, the temporary airtight will bring its unique use when mine ventilation cannot satisfy the time requirement.
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