With the passage of time, the wall that the corrosion and scale and become loose, and be compressed air away.
随着时间的推移，管壁的锈蚀物和结垢变得疏松，并被压缩空气带走。
Thirdly, there is a discussion about scale economy and scope economy of airline alliance in this passage.
再次，本文对航空公司联盟的规模经济性和航空公司联盟的范围经济性进行了论证。
Small scale charts are intended for offshore navigation and passage planning.
小比例尺海图供远离海岸航行和航线设计使用。
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