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The boundary on the cold air side is often ill-defined, especially near the surface.
冷空气一侧的边界常常十分模糊，特别是在地表附近。
youdao
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Boundary is the place where the fault occurs especially easily.
边界是特别容易出现故障的地方。
youdao
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Boundary is the place where the fault occurs especially easily.
边界是特别容易出现故障的地方。
youdao